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Quarterly Results (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. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Results [Abstract]                      
Revenue $ 588,300 $ 526,200 $ 593,200 $ 462,000 $ 495,300 $ 428,400 $ 424,400 $ 395,800 $ 2,169,664 $ 1,743,991 $ 1,537,259
Gross profit 493,200 439,400 497,700 386,200 415,100 357,800 353,300 295,200 1,816,512 1,421,367 1,264,828
Operating income 88,900 82,400 97,900 71,600 75,600 67,200 66,000 24,900 340,844 233,742 217,062
Net Income (Loss) Attributable to Parent $ 59,200 $ 54,200 $ 60,400 $ 47,800 $ 49,500 $ 46,800 $ 41,700 $ 15,300 $ 221,645 $ 153,330 $ 136,051
Net income per share:                      
Basic (in dollars per share) $ 1.01 $ 0.90 $ 0.98 $ 0.77 $ 0.80 $ 0.75 $ 0.67 $ 0.25 $ 3.66 $ 2.47 $ 2.18
Diluted (in dollars per share) $ 0.97 $ 0.87 $ 0.94 $ 0.74 $ 0.76 $ 0.72 $ 0.65 $ 0.24 $ 3.52 $ 2.38 $ 2.11