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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]          
Income tax (expense) benefit $ (9,230) $ 12,861 $ 1,863 $ 16,167  
Federal Tax          
Operating Loss Carryforwards [Line Items]          
NOL carryforward         $ 108,700
Section 382 base limit         77,700
Federal Tax | Subsidiaries          
Operating Loss Carryforwards [Line Items]          
NOL carryforward         $ 108,300