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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Effective tax rate |  | 24.90% | 16.20% | 35.00%
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability | $ (70,400) |  | $ (70,400) |
Federal statutory income tax rate |  | 21.00% | 35.00% | 35.00%
Increase (decrease) in other deferred liability |  | $ 30,500 |  |
Net operating loss carryforwards | 48,722 | 74,213 | $ 48,722 |
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance, amount | 47,955 | 56,925 | 47,955 |
Unrecognized tax benefits | 0 | 0 | 0 |
State Tax Net Operating Losses |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance, amount | $ 46,400 | $ 49,100 | $ 46,400 |
Percent of deferred tax asset for which valuation allowance has been recognized | 100.00% | 100.00% | 100.00% |
Foreign Tax Net Operating Losses |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance, amount | $ 1,600 | $ 7,800 | $ 1,600 |
Percent of deferred tax asset for which valuation allowance has been recognized | 68.00% | 31.00% | 68.00% |

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