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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Prepaid expenses and other assets [1] $ 17,770   $ 17,770   $ 7,266
Other assets (long-term) 3,486   3,486   2,653
Derivatives - current 1,779   1,779   1,785
Derivative loss (gain) 15,414 $ (1,805) (46,498) $ 47,081  
Other Noncurrent Liabilities [Member]          
Other liabilities (long-term) 2,137   2,137   0
Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member] | Prepaid Expenses and Other Current Assets [Member]          
Prepaid expenses and other assets 17,770   17,770   7,266
Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member] | Other Noncurrent Assets [Member]          
Other assets (long-term) 3,486   3,486   2,653
Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member] | Accrued Liabilities [Member]          
Derivatives - current 1,779   1,779   1,785
Open Contracts and Closed Contracts Which Had Not Yet Been Settled [Member] | Other Noncurrent Liabilities [Member]          
Other liabilities (long-term) $ 2,137   $ 2,137   $ 0
[1] Includes closed contracts which have not yet settled.