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Quarterly Financial Data (Summary Of Quarterly Financial Data) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Data [Abstract]                      
Revenue $ 699,161 $ 700,528 $ 690,932 $ 640,603 $ 596,749 $ 591,854 $ 571,561 $ 509,384 $ 2,731,224 $ 2,269,548 $ 1,835,922
Operating income 102,188 117,663 133,790 102,224 93,868 98,010 83,863 74,821 455,865 350,562 287,831
Net income $ 61,353 $ 72,300 $ 81,683 $ 62,664 $ 57,473 $ 60,433 $ 50,657 $ 46,382 $ 278,000 $ 214,945 $ 178,981
Basic earnings per share $ 1.96 $ 2.28 $ 2.58 $ 2.00 $ 1.84 $ 1.93 $ 1.63 $ 1.49 $ 8.82 $ 6.89 $ 5.73
Diluted earnings per share $ 1.95 $ 2.27 $ 2.56 $ 1.97 $ 1.81 $ 1.90 $ 1.59 $ 1.46 $ 8.75 $ 6.76 $ 5.64