Annual report pursuant to Section 13 and 15(d)

Note 18 - Selected Quarterly Financial Data - Unaudited (Details Textual)

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Note 18 - Selected Quarterly Financial Data - Unaudited (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Gain (Loss) on Derivative Instruments, Net, Pretax, Total $ (11,500) $ (11,200) $ (15,400) $ 61,900 $ (18,700) $ 5,900 $ 1,800 $ (48,900) $ 23,808 $ (59,887) $ 53,798
Gain (Loss) on Extinguishment of Debt, Total                 47,469 (0) 47,109
Income Tax Expense (Benefit), Total $ (6,900) $ (21,100) $ (8,700) $ 6,500 $ (8,200) $ (55,500) $ (11,700) $ 200 $ (30,153) $ (75,194) $ 535