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Summary Of Quarterly Data (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
Summary Of Quarterly Data [Abstract]                      
Revenue $ 399,685 $ 406,387 $ 413,343 $ 382,477 $ 351,959 $ 383,523 $ 390,122 $ 360,203 $ 1,601,892 $ 1,485,807 $ 1,377,058
Gross profit 217,695 224,274 232,757 215,544 182,165 213,336 218,518 202,097 890,270 816,116 756,118
Operating income 66,911 71,895 88,303 72,803 34,801 72,189 83,219 70,046 299,912 260,255 266,762
Net income attributable to stockholders $ 44,349 $ 44,223 $ 56,912 $ 46,594 $ 25,961 $ 52,142 $ 57,218 $ 46,585 $ 192,078 $ 181,906 $ 187,800
Earnings per Share:                      
Basic $ 0.49 $ 0.48 $ 0.61 $ 0.49 $ 0.27 $ 0.52 $ 0.56 $ 0.45 $ 2.07 $ 1.82 $ 1.77
Diluted $ 0.48 $ 0.48 $ 0.60 $ 0.49 $ 0.27 $ 0.52 $ 0.55 $ 0.45 $ 2.05 $ 1.79 $ 1.74