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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Data [Abstract]                      
Revenue $ 844,147 $ 826,907 $ 816,786 $ 726,751 $ 699,161 $ 700,528 $ 690,932 $ 640,603 $ 3,214,591 $ 2,731,224 $ 2,269,548
Operating income 129,104 137,154 146,418 120,044 102,188 117,663 133,790 102,224 532,720 455,865 350,562
Net income $ 79,622 $ 83,379 $ 87,853 $ 76,584 $ 61,353 $ 72,300 $ 81,683 $ 62,664 $ 327,438 $ 278,000 $ 214,945
Basic earnings per share $ 2.57 $ 2.70 $ 2.84 $ 2.47 $ 1.96 $ 2.28 $ 2.58 $ 2.00 $ 10.58 $ 8.82 $ 6.89
Diluted earnings per share $ 2.53 $ 2.66 $ 2.82 $ 2.45 $ 1.95 $ 2.27 $ 2.56 $ 1.97 $ 10.47 $ 8.75 $ 6.76