Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Derivative Financial Instruments - Fair Value of Open and Closed Contracts Which Had Not Yet Settled (Details)

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Note 6 - Derivative Financial Instruments - Fair Value of Open and Closed Contracts Which Had Not Yet Settled (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Prepaid expenses and other assets [1] $ 22,089   $ 22,089   $ 60,687
Other assets (non-current)     21,275
Derivative (gain) loss (1,805) $ 6,219 47,081 $ 6,219  
Prepaid Expenses and Other Current Assets [Member] | Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member]          
Prepaid expenses and other assets 22,089   22,089   60,687
Other Noncurrent Assets [Member] | Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member]          
Other assets (non-current)     $ 21,275
[1] Includes closed contracts which have not yet settled.