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Income Taxes - Schedule of Significant Components of the Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:      
U.S. federal $ 1,501 $ 254 $ 5,966
U.S. state and local 427 953 598
Non-U.S. 448 220 0
Total current income tax expense 2,376 1,427 6,564
Deferred:      
U.S. federal (27,692) 11,133 (110,361)
U.S. state and local (4,636) 5,560 1,516
Non-U.S. (3) 0 0
Total deferred income tax (benefit) expense (32,331) 16,693 (108,845)
Income tax (benefit) expense $ (29,955) $ 18,120 $ (102,281)