Fair Value Measurement (Carrying Values And Fair Values Of The Company's Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Term-A Facility [Member]	Dec. 31, 2013 Term-A Facility [Member]	Mar. 31, 2014 7.75% Senior Notes [Member]	Dec. 31, 2013 7.75% Senior Notes [Member]	Jun. 30, 2011 7.75% Senior Notes [Member]	Mar. 31, 2014 4.75% Senior Notes [Member]	Dec. 31, 2013 4.75% Senior Notes [Member]	Dec. 17, 2012 4.75% Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	$ 2,757,763	$ 2,157,183	$ 1,478,399	$ 878,315	$ 688,779	$ 688,497		$ 590,585	$ 590,371
Long-term Debt, Fair Value	$ 2,864,900	$ 2,235,700	$ 1,478,150	$ 876,700	$ 792,750	$ 787,500		$ 594,000	$ 571,500
Debt Instrument, Interest Rate, Stated Percentage					7.75%		7.75%	4.75%		4.75%