Contractual interest rate for funds borrowed, under the debt agreement.

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Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 27, 2017	Jun. 24, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 2,926,083	$ 2,919,185
Senior Secured Credit Agreement \| Term B Loans Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 188,357	$ 187,725
Debt instrument interest rate, percent	3.84%	3.84%
Senior Secured Credit Agreement \| Term B Loans Facility \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 187,965	$ 189,704
Senior Secured Credit Agreement \| Term C Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 1,647,587	$ 1,644,109	$ 1,761,000
Debt instrument interest rate, percent	3.85%	3.85%
Senior Secured Credit Agreement \| Term C Loan Facility \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 1,631,742	$ 1,666,942
Senior Notes 5.875% due 2022 \| Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	1,090,139	1,087,351
Debt instrument interest rate, percent				5.875%
Senior Notes 5.875% due 2022 \| Senior Notes \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 1,111,000	$ 1,132,417