Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information (Summary Of Quarterly Financial Information) (Details)

v3.3.1.900
Quarterly Financial Information (Summary Of Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]                      
Revenue $ 734,572 $ 779,474 $ 762,151 $ 696,245 $ 721,048 $ 743,586 $ 702,987 $ 620,276 $ 2,972,442 $ 2,787,897 $ 2,337,648
Operating income 113,922 139,854 140,899 103,565 112,298 126,262 122,695 80,052 498,240 441,307 338,438
Net income $ 72,224 $ 84,368 $ 85,574 $ 62,524 $ 69,869 $ 77,909 $ 73,849 $ 45,887 $ 304,690 $ 267,514 $ 206,113
Basic and diluted $ 0.85 $ 0.99 $ 1.00 $ 0.73 $ 0.81 $ 0.90 $ 0.86 $ 0.53 $ 3.57 $ 3.10