Income Taxes - Narrative (Details) - USD ($) $ in Thousands |
1 Months Ended | 3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Feb. 28, 2018 |
Feb. 29, 2016 |
Dec. 31, 2017 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Operating Loss Carryforwards [Line Items] | ||||||
| Remeasurement of net deferred tax liabilities | $ 140,000 | |||||
| Income tax receivable, related to carrybacks | $ 14,500 | |||||
| Income taxes receivable, related to overpayments | 5,400 | |||||
| Income tax receivable | 100,023 | 29,148 | $ 100,023 | |||
| Proceeds from refund of overpaid federal tax | $ 77,000 | $ 120,000 | ||||
| Uncertain tax benefits that, if recognized, would affect effective tax rate | $ 1,700 | 2,500 | 1,700 | |||
| Recognized interest and penalties expense (benefit) related to unrecognized tax benefits | 100 | $ 600 | $ 100 | |||
| Accrued interest and penalties | 300 | |||||
| State Tax | ||||||
| Operating Loss Carryforwards [Line Items] | ||||||
| Tax credit carryforward | 6,900 | |||||
| Federal Tax | ||||||
| Operating Loss Carryforwards [Line Items] | ||||||
| Net operating loss carryforwards | $ 267,000 | |||||