Debt - Schedule of Debt Components (Details)	6 Months Ended
	Jun. 30, 2018 USD ($)	Mar. 29, 2018 USD ($) contract	Dec. 31, 2017 USD ($)
Debt Obligations
Total Debt Obligations	$ 1,001,598,000		$ 906,398,000
Unamortized discount
Total unamortized discount	(2,942,000)		(2,600,000)
Unamortized debt issuance costs:
Total unamortized debt issuance costs	(4,915,000)		(5,583,000)
Total Debt	$ 993,741,000		898,215,000
Interest rate swaps
Unamortized debt issuance costs:
Number of interest rate swap contracts | contract		2
Fixed rate	2.85%
Term Loan
Debt Obligations
Total Debt Obligations	$ 1,001,598,000		906,398,000
Unamortized discount
Total unamortized discount	(2,942,000)		(2,600,000)
Unamortized debt issuance costs:
Total unamortized debt issuance costs	$ (4,915,000)		$ (5,583,000)
Effective interest rate	4.84%		4.62%
Notional amount		$ 800,000,000.0
Term Loan | LIBOR
Unamortized debt issuance costs:
Basis spread on variable rate	2.75%
Floor interest rate	1.00%
Line of Credit | Revolving Credit Facility
Debt Obligations
Total Debt Obligations	$ 0		$ 0