Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands |
Mar. 31, 2019 |
Mar. 15, 2019 |
Dec. 31, 2018 |
Nov. 30, 2017 |
|---|---|---|---|---|
| Debt Instrument [Line Items] | ||||
| Total long-term debt, net | $ 880,855 | $ 691,630 | ||
| Senior Notes | ||||
| Debt Instrument [Line Items] | ||||
| Unamortized debt discount | (3,825) | 0 | ||
| Unamortized debt issuance costs on Senior Notes | (15,320) | (8,370) | ||
| Total long-term debt, net | 880,855 | 391,630 | ||
| Senior Notes | Senior Notes Due 2026 | ||||
| Debt Instrument [Line Items] | ||||
| Gross amount of long-term debt | $ 400,000 | 400,000 | ||
| Interest rate, stated percentage | 5.375% | 5.375% | ||
| Senior Notes | Senior Notes Due 2027 | ||||
| Debt Instrument [Line Items] | ||||
| Gross amount of long-term debt | $ 500,000 | 0 | ||
| Unamortized debt discount | $ (3,800) | |||
| Interest rate, stated percentage | 6.875% | 6.875% | ||
| Revolving Credit Facility | Line of Credit | ||||
| Debt Instrument [Line Items] | ||||
| Gross amount of long-term debt | $ 0 | $ 300,000 |