Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Income Tax Expense (Benefit) (Details)

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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current $ (12,786) $ (71,768) $ 288
Deferred 217 28,392 (203,272)
Total income tax (benefit) $ (12,569) $ (43,376) $ (202,984)