Debt (Summary Of Long-Term Debt) (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]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 2,780,000	$ 2,180,000	$ 1,480,000	$ 880,000		$ 700,000	$ 700,000	$ 600,000	$ 600,000	$ 600,000
Debt Instrument, Unamortized Discount	(22,237)	(22,817)
Long-term Debt	2,757,763	2,157,183	1,478,399	878,315	688,779	688,497		590,585	590,371
Debt, Current	18,500	0
Long-term Debt, Excluding Current Maturities	$ 2,739,263	$ 2,157,183
Debt Instrument, Interest Rate, Stated Percentage					7.75%		7.75%	4.75%		4.75%