Fair Value Measurement (Carrying Values And Fair Values Of The Company's Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 2,723,806	$ 2,759,566
Long-term Debt, Fair Value	2,785,088	2,811,450
Term-A Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	1,441,831	1,478,659
Long-term Debt, Fair Value	1,424,963	1,465,200
7.75% Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	690,274	689,659
Long-term Debt, Fair Value	$ 758,625	$ 761,250
Debt Instrument, Interest Rate, Stated Percentage	7.75%	7.75%
4.75% Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 591,701	$ 591,248
Long-term Debt, Fair Value	$ 601,500	$ 585,000
Debt Instrument, Interest Rate, Stated Percentage	4.75%	4.75%