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Income Taxes - Narratives (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 26, 2018 | Dec. 31, 2015
Operating Loss Carryforwards |  |  |  |  |
Tax cuts and jobs act, income tax expense (benefit) |  | $ (53,400) |  |  |
Effective income tax rate (percent) | 17.40% | 143.30% | 27.50% |  |
Remeasurement of uncertain tax positions | $ 3,700 |  |  |  |
Net deferred tax asset included in other long term assets | 4,200 |  |  |  |
Net deferred tax liability |  | $ 97,943 |  |  |
Deferred tax assets | 51,953 | 65,238 |  | $ 52,200 |
Valuation allowances | 45,439 | 300 |  | 50,800 |
Cumulative effect from adoption of new accounting principle |  |  | $ 1,200 |  |
Unrecognized tax benefits | 19,560 | 21,400 | 9,665 |  | $ 11,998
Unrecognized tax benefits that would impact tax rate if recognized | 8,800 | 9,600 | 3,100 |  |
Accrued income tax interest and penalties | 2,200 | 1,600 | 200 |  |
Income tax interest and penalty expenses | 700 | 1,400 |  |  |
Indemnification asset | 7,100 | 6,400 |  |  |
Amount refunded | 1,700 |  | 5,600 |  |
Decrease in uncertain tax positions | 3,500 |  | 3,500 |  |
Minimum |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Anticipated decrease to unrecognized tax benefits | 3,000 |  |  |  |
Maximum |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Anticipated decrease to unrecognized tax benefits | 7,000 |  |  |  |
Domestic |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Operating loss carryforwards | $ 357,300 |  |  |  |
Operating loss carryforward, expiration date | Dec. 31, 2025 |  |  |  |
Operating loss carryforward not subject to expiration | $ 115,400 |  |  |  |
State |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Operating loss carryforwards | $ 143,900 |  |  |  |
Operating loss carryforward, expiration date | Dec. 31, 2020 |  |  |  |
Operating loss carryforward not subject to expiration | $ 23,500 |  |  |  |
NOL valuation allowance | 200 |  |  |  |
ASU 2016-09 |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Deferred tax assets |  |  | 600 |  |
Valuation allowances |  |  | 600 |  |
Partnership Merger |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Deferred tax assets acquired |  |  |  | 156,000 |
Deferred Tax Asset |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Net deferred tax liability | 2,800 |  |  |  |
Other comprehensive income |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Tax cuts and jobs act, income tax expense (benefit) |  | (300) |  |  |
Continuing Operations |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Tax cuts and jobs act, income tax expense (benefit) |  | (57,700) |  |  |
Deferred tax assets |  |  |  | 46,600 |
Valuation allowances |  |  |  | 45,200 |
Discontinued Operations |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Tax cuts and jobs act, income tax expense (benefit) |  | 4,600 |  |  |
Deferred tax assets |  |  |  | 5,600 |
Valuation allowances |  |  |  | $ 5,600 |
Unrecognized tax benefits that would impact tax rate if recognized | $ 6,900 | $ 6,400 | $ 6,600 |  |

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