Annual report pursuant to Section 13 and 15(d)

Income Taxes (Schedule of Income Tax Benefit (Expense)) (Details)

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Income Taxes (Schedule of Income Tax Benefit (Expense)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 607 $ 0 $ 0
State and local (24) 0 575
Current income tax benefit (expense) 583 0 575
Deferred:      
Federal 190,931 160,150 (436,260)
State and local (8,207) (26,628) (60,560)
Deferred tax benefit (expense) 182,724 133,522 (496,820)
Income tax benefit (expense) $ 183,307 $ 133,522 $ (496,245)