Debt (Summary Of Long-Term Debt) (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 2,743,000	$ 2,780,000
Debt Instrument, Unamortized Discount		(19,194)	(20,434)
Long-term Debt		2,723,806	2,759,566
Debt, Current		111,000	74,000
Long-term debt		2,612,806	2,685,566
Term-A Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	1,443,000	1,480,000
Long-term Debt		1,441,831	1,478,659
7.75% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		700,000	700,000
Long-term Debt		$ 690,274	$ 689,659
Debt Instrument, Interest Rate, Stated Percentage		7.75%	7.75%
4.75% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 600,000	$ 600,000
Long-term Debt		$ 591,701	$ 591,248
Debt Instrument, Interest Rate, Stated Percentage		4.75%	4.75%

[1] (a)The Company’s $500,000 revolving credit facility remains undrawn at June 30, 2015. Total undrawn revolver commitments are available to be drawn for general corporate purposes of the Company.