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Long-Term Debt (Details Textual)		6 Months Ended
	Jun. 11, 2018 USD ($)	Jun. 30, 2018 USD ($) Installment	Jun. 10, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Outstanding Amount		$ 970,381,000		$ 972,959,000
Revolving Credit Facility [Member] | Incremental Joinder Agreement No. 1 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 140,000,000		$ 100,000,000
Agreement start date	Jun. 11, 2018
Senior Secured First Lien Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		940,000,000
Senior Secured First Lien Credit Facility [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		140,000,000
Line of Credit Facility, Undrawn		$ 140,000,000
Line of Credit Facility, Expiration Date		Oct. 20, 2022
Senior Secured First Lien Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Outstanding Amount		$ 0
Senior Secured First Lien Credit Facility [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		800,000,000
Debt Instrument, Outstanding Amount		$ 796,000,000
Debt Instrument, Maturity Date		Oct. 20, 2024
Debt Instrument, Number of Quarterly Payments | Installment		27
Debt Instrument, Periodic Payment		$ 2,000,000
Debt Instrument, Commencement Date of Quarterly Payments		Mar. 31, 2018
Debt Instrument, Final Installment		$ 746,000,000
Senior Secured Second Lien Credit Facility [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		200,000,000
Debt Instrument, Outstanding Amount		$ 200,000,000
Debt Instrument, Maturity Date		Oct. 20, 2025
Credit Facilities [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		5.60%

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