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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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