Quarterly report pursuant to Section 13 or 15(d)

Note 15 - Segment Information - Summary of Reportable Segments (Details)

v3.10.0.1
Note 15 - Segment Information - Summary of Reportable Segments (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Average Rates Per Day $ 7,324 $ 5,649 $ 7,174 $ 5,683  
Fleet Utilization 62.00% 56.00% 58.00% 51.00%  
Fleet Available Days 12,528 12,363 25,129 24,130  
Operating Revenues $ 60,701 $ 42,323 $ 112,422 $ 76,627  
Direct Costs and Expenses 45,980 40,792 84,328 70,580  
Direct Vessel Profit 14,721 1,531 28,094 6,047  
Operating expenses 36,778 40,028 71,922 67,948  
Administrative and general 15,532 21,705 28,339 33,531  
Depreciation and amortization 18,406 14,633 37,918 27,136  
Gains (Losses) on Asset Dispositions and Impairments, Net 1,055 (6,318) (1,588) (1,499)  
Operating Loss (21,002) (44,815) (45,416) (63,400)  
Historical cost 1,287,855 1,155,155 1,287,855 1,155,155 $ 1,179,836
Accumulated depreciation (564,477) (543,822) (564,477) (543,822) (560,160)
723,378 611,333 723,378 611,333 $ 619,676
Leased-in Equipment [Member]          
Operating expenses 2,840 3,690 5,665 7,281  
Time Charter [Member]          
Operating Revenues 56,826 38,803 103,968 69,533  
Bareboat Charter [Member]          
Operating Revenues 1,156 1,156 2,299 2,299  
Other Marine Services [Member]          
Operating Revenues 2,719 2,364 6,155 4,795  
Personnel [Member]          
Direct Costs and Expenses 24,733 20,577 46,409 37,368  
Repairs and Maintenance [Member]          
Direct Costs and Expenses 9,070 10,425 16,143 14,020  
Drydocking [Member]          
Direct Costs and Expenses 3,112 2,251 5,369 5,318  
Insurance and Loss Reserves [Member]          
Direct Costs and Expenses 1,934 2,126 3,124 3,685  
Fuel, Lubes and Supplies [Member]          
Direct Costs and Expenses 4,122 3,190 7,667 5,532  
Other Direct Costs and Expenses [Member]          
Direct Costs and Expenses 3,009 2,223 5,616 4,657  
UNITED STATES          
Average Rates Per Day $ 10,503 $ 9,619 $ 9,740 $ 9,808  
Fleet Utilization 23.00% 13.00% 20.00% 10.00%  
Fleet Available Days 3,710 4,063 7,760 8,061  
Operating Revenues $ 10,728 $ 6,087 $ 18,365 $ 9,908  
Direct Costs and Expenses 8,906 7,231 15,069 12,858  
Direct Vessel Profit 1,822 (1,144) 3,296 (2,950)  
Administrative and general  
Depreciation and amortization 5,915 5,749 12,450 11,349  
Historical cost 439,026 417,675 439,026 417,675  
Accumulated depreciation (225,116) (233,758) (225,116) (233,758)  
213,910 183,917 213,910 183,917  
UNITED STATES | Leased-in Equipment [Member]          
Operating expenses 1,856 2,205 3,718 4,416  
UNITED STATES | Time Charter [Member]          
Operating Revenues 9,052 4,889 15,034 7,884  
UNITED STATES | Bareboat Charter [Member]          
Operating Revenues  
UNITED STATES | Other Marine Services [Member]          
Operating Revenues 1,676 1,198 3,331 2,024  
UNITED STATES | Personnel [Member]          
Direct Costs and Expenses 4,636 4,183 8,628 7,313  
UNITED STATES | Repairs and Maintenance [Member]          
Direct Costs and Expenses 1,529 937 2,223 1,674  
UNITED STATES | Drydocking [Member]          
Direct Costs and Expenses 910 310 1,435 883  
UNITED STATES | Insurance and Loss Reserves [Member]          
Direct Costs and Expenses 902 1,205 1,336 2,010  
UNITED STATES | Fuel, Lubes and Supplies [Member]          
Direct Costs and Expenses 900 545 1,393 855  
UNITED STATES | Other Direct Costs and Expenses [Member]          
Direct Costs and Expenses 29 51 54 123  
Africa [Member]          
Average Rates Per Day $ 9,509 $ 10,348 $ 9,482 $ 9,913  
Fleet Utilization 88.00% 67.00% 89.00% 64.00%  
Fleet Available Days 1,331 1,123 2,591 2,142  
Operating Revenues $ 11,472 $ 8,001 $ 23,553 $ 14,040  
Direct Costs and Expenses 9,437 9,277 16,791 14,873  
Direct Vessel Profit 2,035 (1,276) 6,762 (833)  
Administrative and general  
Depreciation and amortization 2,924 2,059 5,731 3,649  
Historical cost 184,037 183,661 184,037 183,661  
Accumulated depreciation (57,909) (59,300) (57,909) (59,300)  
126,128 124,361 126,128 124,361  
Africa [Member] | Leased-in Equipment [Member]          
Operating expenses 962 969 1,925 1,939  
Africa [Member] | Time Charter [Member]          
Operating Revenues 11,122 7,786 21,916 13,633  
Africa [Member] | Bareboat Charter [Member]          
Operating Revenues  
Africa [Member] | Other Marine Services [Member]          
Operating Revenues 350 215 1,637 407  
Africa [Member] | Personnel [Member]          
Direct Costs and Expenses 4,314 3,428 8,387 6,036  
Africa [Member] | Repairs and Maintenance [Member]          
Direct Costs and Expenses 1,663 3,234 3,019 3,778  
Africa [Member] | Drydocking [Member]          
Direct Costs and Expenses 910 683 912 1,740  
Africa [Member] | Insurance and Loss Reserves [Member]          
Direct Costs and Expenses 248 357 466 539  
Africa [Member] | Fuel, Lubes and Supplies [Member]          
Direct Costs and Expenses 900 704 1,569 1,263  
Africa [Member] | Other Direct Costs and Expenses [Member]          
Direct Costs and Expenses 1,402 871 2,438 1,517  
Middle East and Asia [Member]          
Average Rates Per Day $ 8,226 $ 6,580 $ 8,155 $ 6,765  
Fleet Utilization 82.00% 55.00% 74.00% 52.00%  
Fleet Available Days 2,005 2,067 4,137 3,777  
Operating Revenues $ 12,799 $ 7,524 $ 24,043 $ 14,224  
Direct Costs and Expenses 9,836 10,774 18,753 16,966  
Direct Vessel Profit 2,963 (3,250) 5,290 (2,742)  
Administrative and general  
Depreciation and amortization 4,311 3,979 10,401 6,506  
Historical cost 317,536 302,892 317,536 302,892  
Accumulated depreciation (86,239) (83,880) (86,239) (83,880)  
231,297 219,012 231,297 219,012  
Middle East and Asia [Member] | Leased-in Equipment [Member]          
Operating expenses 516 862  
Middle East and Asia [Member] | Time Charter [Member]          
Operating Revenues 13,591 7,415 24,965 13,238  
Middle East and Asia [Member] | Bareboat Charter [Member]          
Operating Revenues  
Middle East and Asia [Member] | Other Marine Services [Member]          
Operating Revenues (792) 109 (922) 986  
Middle East and Asia [Member] | Personnel [Member]          
Direct Costs and Expenses 4,069 4,147 8,091 7,270  
Middle East and Asia [Member] | Repairs and Maintenance [Member]          
Direct Costs and Expenses 3,576 3,947 6,004 4,523  
Middle East and Asia [Member] | Drydocking [Member]          
Direct Costs and Expenses 72 358 61 516  
Middle East and Asia [Member] | Insurance and Loss Reserves [Member]          
Direct Costs and Expenses 361 353 597 699  
Middle East and Asia [Member] | Fuel, Lubes and Supplies [Member]          
Direct Costs and Expenses 922 908 1,956 1,432  
Middle East and Asia [Member] | Other Direct Costs and Expenses [Member]          
Direct Costs and Expenses 836 1,061 2,044 2,526  
Brazil, Mexico, Central and South America [Member]          
Average Rates Per Day $ 19,127 $ 18,069  
Fleet Utilization 57.00% 52.00%  
Fleet Available Days 416 105 635 195  
Operating Revenues $ 6,557 $ 1,318 $ 9,184 $ 2,536  
Direct Costs and Expenses 2,268 298 3,141 323  
Direct Vessel Profit 4,289 1,020 6,043 2,213  
Administrative and general  
Depreciation and amortization 2,280 784 3,499 1,449  
Historical cost 165,145 78,976 165,145 78,976  
Accumulated depreciation (58,078) (41,565) (58,078) (41,565)  
107,067 37,411 107,067 37,411  
Brazil, Mexico, Central and South America [Member] | Leased-in Equipment [Member]          
Operating expenses  
Brazil, Mexico, Central and South America [Member] | Time Charter [Member]          
Operating Revenues 4,556 5,930  
Brazil, Mexico, Central and South America [Member] | Bareboat Charter [Member]          
Operating Revenues 1,156 1,156 2,299 2,299  
Brazil, Mexico, Central and South America [Member] | Other Marine Services [Member]          
Operating Revenues 845 162 955 237  
Brazil, Mexico, Central and South America [Member] | Personnel [Member]          
Direct Costs and Expenses 1,219 148 1,595 161  
Brazil, Mexico, Central and South America [Member] | Repairs and Maintenance [Member]          
Direct Costs and Expenses 32 116 337 120  
Brazil, Mexico, Central and South America [Member] | Drydocking [Member]          
Direct Costs and Expenses 11 11  
Brazil, Mexico, Central and South America [Member] | Insurance and Loss Reserves [Member]          
Direct Costs and Expenses 169 4 236 11  
Brazil, Mexico, Central and South America [Member] | Fuel, Lubes and Supplies [Member]          
Direct Costs and Expenses 349 27 414 27  
Brazil, Mexico, Central and South America [Member] | Other Direct Costs and Expenses [Member]          
Direct Costs and Expenses 488 3 548 4  
Europe [Member]          
Average Rates Per Day $ 4,823 $ 4,176 $ 4,984 $ 4,294  
Fleet Utilization 76.00% 90.00% 72.00% 81.00%  
Fleet Available Days 5,066 5,005 10,006 9,955  
Operating Revenues $ 19,145 $ 19,393 $ 37,277 $ 35,919  
Direct Costs and Expenses 15,533 13,212 30,574 25,560  
Direct Vessel Profit 3,612 6,181 6,703 10,359  
Administrative and general  
Depreciation and amortization 2,976 2,062 5,837 4,183  
Historical cost 182,111 171,951 182,111 171,951  
Accumulated depreciation (137,135) (125,319) (137,135) (125,319)  
44,976 46,632 44,976 46,632  
Europe [Member] | Leased-in Equipment [Member]          
Operating expenses 22 22 64  
Europe [Member] | Time Charter [Member]          
Operating Revenues 18,505 18,713 36,123 34,778  
Europe [Member] | Bareboat Charter [Member]          
Operating Revenues  
Europe [Member] | Other Marine Services [Member]          
Operating Revenues 640 680 1,154 1,141  
Europe [Member] | Personnel [Member]          
Direct Costs and Expenses 10,495 8,671 19,708 16,588  
Europe [Member] | Repairs and Maintenance [Member]          
Direct Costs and Expenses 2,270 2,191 4,560 3,925  
Europe [Member] | Drydocking [Member]          
Direct Costs and Expenses 1,209 900 2,950 2,179  
Europe [Member] | Insurance and Loss Reserves [Member]          
Direct Costs and Expenses 254 207 489 426  
Europe [Member] | Fuel, Lubes and Supplies [Member]          
Direct Costs and Expenses 1,051 1,006 2,335 1,955  
Europe [Member] | Other Direct Costs and Expenses [Member]          
Direct Costs and Expenses $ 254 $ 237 $ 532 $ 487