Annual report pursuant to Section 13 and 15(d)

Income Taxes - Income Tax Reconciliation (Details)

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Income Taxes - Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Differences between provision for income taxes and income tax expense computed by applying federal rates      
US federal income tax rate 21.00% 21.00% 35.00%
Computed expected tax benefits (expense) $ (32,583) $ (19,294) $ (857,710)
State and local taxes, net of federal income taxes (5,414) (3,831) (74,805)
Change in valuation allowance (249) 380 (1,208)
Change in tax rate - other 18 (27)  
Change in tax rate - U.S. tax reform     515,773
Derivative instruments 246 768 1,084
Other 40 80 (67)
Income tax benefit (expense) $ (37,942) $ (21,924) $ (416,933)