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Amount, after accumulated amortization, of debt discount.

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Long-term Debt (Summary of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jul. 28, 2017	Mar. 30, 2016	Dec. 17, 2012
Debt Instrument [Line Items]
Long-term debt	$ 2,875,000	$ 3,131,250
Unamortized discount	(18,337)	(24,351)
Unamortized deferred financing costs	(7,356)	(10,670)
Long-term debt, net	2,849,307	3,096,229
Current portion of long-term debt	75,000	56,250
Noncurrent portion of long-term debt	2,774,307	3,039,979
Term-A Facility [Member]
Debt Instrument [Line Items]
Long-term debt, net	669,878	723,560
4.75% Senior Notes Due December 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, net	$ 398,230	595,813
Debt, interest rate	4.75%
5.00% Senior Notes Due April 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, net	$ 991,074	988,609
Debt, interest rate	5.00%
4.75% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, net	$ 790,125	788,247
Debt, interest rate	4.75%
Senior Notes [Member] \| 4.75% Senior Notes Due December 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 400,000	600,000
Unamortized discount					$ (10,500)
Debt, interest rate	4.75%
Senior Notes [Member] \| 5.00% Senior Notes Due April 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,000,000	1,000,000
Unamortized discount				$ (17,500)
Debt, interest rate	5.00%
Senior Notes [Member] \| 4.75% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 800,000	800,000
Debt, interest rate	4.75%
Secured Debt [Member] \| Term-A Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 675,000	$ 731,250	$ 675,000