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
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Prepaid expenses and other assets [1] $ 64,039   $ 7,266
Other assets (long-term) 2,847   2,653
Derivatives - current   1,785
Derivative (gain) loss (61,912) $ 48,886  
Other Noncurrent Liabilities [Member]      
Other liabilities (long-term) 1,245  
Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member] | Prepaid Expenses and Other Current Assets [Member]      
Prepaid expenses and other assets 64,039   7,266
Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member] | Other Noncurrent Assets [Member]      
Other assets (long-term) 2,847   2,653
Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member] | Accrued Liabilities [Member]      
Derivatives - current   1,785
Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member] | Other Noncurrent Liabilities [Member]      
Other liabilities (long-term) $ 1,245  
[1] Includes closed contracts which have not yet settled.