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Long-term Debt - Senior Notes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Sep. 19, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 20, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Payments of Financing Costs |  | $ 1,100 |  |  |  |  |
Debt financing and related expenses |  |  |  | $ 6,640 | $ 0 | $ 1,970 |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 300,000 |  |  | $ 300,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.875% |  |  | 4.875% |  |  |
Debt Instrument, Maturity Date | Oct. 15, 2025 |  |  |  |  |  |
Payments of Financing Costs |  | 5,000 |  |  |  |  |
Debt Issuance Costs, Noncurrent, Net |  |  |  |  |  |  | $ 4,900
Debt financing and related expenses |  | 100 |  |  |  |  |
Debt Instrument, Date of First Required Payment | Apr. 15, 2018 |  |  |  |  |  |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage of principal that can be redeemed with cash proceeds from an equity offering | 35.00% |  |  |  |  |  |
Debt instrument redemption price with net proceeds from equity offering | 104.875% |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |  |  |  |  |  |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Two [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 102.438% |  |  |  |  |  |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Three [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 101.219% |  |  |  |  |  |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Four [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |  |  |  |  |  |
Senior Secured Term Loan A [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 275,000 |  |  |  |
Debt Instrument, Maturity Date |  |  | Jun. 30, 2020 |  |  |  |
Repayments of Debt |  | 250,900 |  |  |  |  |
Interest Paid |  | 400 |  |  |  |  |
Receivables Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Jun. 30, 2020 |  |  |
Repayments of Debt |  | $ 41,700 |  |  |  |  |

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