Fair Value Measurements Estimated Fair Values and Carrying Amounts (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 2,927,791	$ 2,926,083
Senior Secured Credit Agreement \| Term B Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	188,514	188,357
Senior Secured Credit Agreement \| Term B Loans \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	189,270	187,965
Senior Secured Credit Agreement \| Term C Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,648,451	1,647,587
Senior Secured Credit Agreement \| Term C Loans \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	1,662,561	1,631,742
5.875% Senior Notes due 2022 \| Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,090,826	1,090,139
5.875% Senior Notes due 2022 \| Senior Notes \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	1,123,716	1,111,000
5.875% Senior Notes due 2022 \| Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 1,090,826	$ 1,090,139
Stated interest rate	5.875%	5.875%

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

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-Name Accounting Standards Codification
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-Section S99
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+ References

No definition available.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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