Fair Value Measurement (Carrying Values And Fair Values Of The Company's Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	$ 2,154,692	$ 2,153,315
Long-term Debt, Fair Value	2,223,020	2,280,654
Term-A Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	876,797	876,358
Long-term Debt, Fair Value	879,270	876,154
7.75% Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	687,949	687,423
Long-term Debt, Fair Value	764,750	801,500
4.75% Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	589,946	589,534
Long-term Debt, Fair Value	$ 579,000	$ 603,000