Debt (Summary Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Term-A Facility [Member]	Dec. 31, 2012 Term-A Facility [Member]	Dec. 31, 2013 7.75% Senior Notes [Member]	Dec. 31, 2012 7.75% Senior Notes [Member]	Jun. 30, 2011 7.75% Senior Notes [Member]	Dec. 31, 2013 4.75% Senior Notes [Member]	Dec. 31, 2012 4.75% Senior Notes [Member]	Dec. 17, 2012 4.75% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 2,180,000	$ 2,180,000	$ 880,000	$ 880,000	$ 700,000	$ 700,000		$ 600,000	$ 600,000
Debt Instrument, Unamortized Discount	(22,817)	(26,685)					(14,000)			(10,500)
Long-term Debt, Net	$ 2,157,183	$ 2,153,315	$ 878,315	$ 876,358	$ 688,497	$ 687,423		$ 590,371	$ 589,534