Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Derivative Instruments and Hedging Strategies - Gains (Losses) on Derivative Instruments (Details)

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Note 6 - Derivative Instruments and Hedging Strategies - Gains (Losses) on Derivative Instruments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Gains (losses) on derivative instruments $ (14,184) $ (302)
Embedded Derivative Financial Instruments [Member]    
Gains (losses) on derivative instruments (15,054) 145
Foreign Exchange Option [Member]    
Gains (losses) on derivative instruments (56)
Interest Rate Swap [Member]    
Gains (losses) on derivative instruments $ 870 $ (391)