Fair Value Measurement (Carrying Values And Fair Values Of The Company's Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2011	Dec. 17, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	$ 2,795,231	$ 2,811,450
Long-term debt	2,741,682	2,759,566
Term-A Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	1,443,231	1,465,200
Long-term debt	1,460,245	1,478,659
7.75% Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	759,500	761,250
Long-term debt	689,964	689,659
Debt Instrument, Interest Rate, Stated Percentage	7.75%	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, Fair Value	592,500	585,000
Long-term debt	$ 591,473	$ 591,248
Debt Instrument, Interest Rate, Stated Percentage	4.75%	4.75%		4.75%