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Debt (Summary Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 2,180,000 $ 2,180,000
Debt Instrument, Unamortized Discount (24,595) (26,685)
Long-term Debt 2,155,405 2,153,315
Term-A Facility [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 880,000 880,000
Long-term Debt 877,024 876,358
7.75% Senior Notes [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 700,000 700,000
Long-term Debt 688,223 687,423
4.75% Senior Notes [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 600,000 600,000
Long-term Debt $ 590,158 $ 589,534