Income Taxes - Narrative (Details) - USD ($) $ in Thousands |
1 Months Ended | 3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Feb. 29, 2016 |
Dec. 31, 2017 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Income Tax Disclosure [Abstract] | |||||
| Remeasurement of net deferred tax liabilities | $ 140,000 | ||||
| Income Tax Receivable | 100,023 | $ 100,023 | $ 11,884 | ||
| Uncertain tax benefits that, if recognized, would affect effective tax rate | 1,700 | 1,700 | 2,500 | ||
| Recognized interest and penalties expense (benefit) related to unrecognized tax benefits | (600) | 100 | $ 400 | ||
| Accrued interest and penalties | $ 300 | $ 300 | $ 900 | ||
| Proceeds from refund of overpaid federal tax | $ 120,000 | ||||