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Long-term Debt - Senior Notes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 20, 2017
Debt Instrument [Line Items] |  |  |  |
Cash paid for interest |  | $ 7,840 | $ 9,020 |
Payments of Financing Costs | $ 1,100 |  |  |
Debt Issuance Costs, Noncurrent, Net |  |  |  | $ 1,100
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 300,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.875% |  |
Debt Instrument, Maturity Date |  | Oct. 15, 2025 |  |
Payments of Financing Costs | 5,000 |  |  |
Debt Issuance Costs, Noncurrent, Net |  |  |  | $ 4,900
Debt Related Commitment Fees and Debt Issuance Costs | 100 |  |  |
Debt Instrument, Date of First Required Payment |  | Apr. 15, 2018 |  |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | Prior to October 15, 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of principal that can be redeemed with cash from proceeds of 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] | October 15, 2020 to October 14, 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 102.438% |  |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | October 15, 2021 to October 14, 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 101.219% |  |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | October 15, 2022 and thereafter [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |
Senior Secured Term Loan A [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of Debt | 250,900 |  |  |
Cash paid for interest | 400 |  |  |
Receivables Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of Debt | $ 41,700 |  |  |

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