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
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Gains (losses) on derivative instruments $ (9,797) $ 12,720
Embedded Derivative Financial Instruments [Member]    
Gains (losses) on derivative instruments (11,096) 13,119
Foreign Exchange Option [Member]    
Gains (losses) on derivative instruments (78)
Interest Rate Swap [Member]    
Gains (losses) on derivative instruments $ 1,299 $ (321)