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Segment Information (Reconciliation Statement Of Segment Income From Operations To Consolidated Income Before Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Information [Abstract]                      
Income (loss) from operations $ 139,728 $ 76,256 $ 95,354 $ 102,238 $ 86,938 $ 98,347 $ 106,499 $ 32,200 $ 413,576 $ 323,984 $ 123,714
Interest expense                 (230,186) (142,549) (105,932)
Interest income                 3,309 2,449 7,622
Bridge financing costs related to ICG                 (49,490)    
Net loss resulting from early retirement of debt                 (1,958) (6,776)  
Income before income taxes                 $ 135,251 $ 177,108 $ 25,404