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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 31, 2012
Sep. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share Reconciliation [Abstract]                      
Net income $ 141,582 $ 98,048 $ 89,314 $ 121,059 $ 175,944 $ 99,109 $ 97,724 $ 88,666 $ 450,003 $ 461,443 $ 432,968
Net income per basic common share $ 1.67 $ 1.15 $ 1.04 $ 1.41 $ 2.03 $ 1.13 $ 1.11 $ 1.00 $ 5.27 $ 5.25 $ 4.77
Net income per diluted common share $ 1.65 $ 1.14 $ 1.03 $ 1.39 $ 2.00 $ 1.12 $ 1.09 $ 0.98 $ 5.20 $ 5.19 $ 4.69
Weighted-average number of basic common shares 85,006,000 85,185,000 85,482,000 86,049,000 86,712,000 87,411,000 88,317,000 88,992,000 85,426,000 87,841,000 90,833,000
Effect of dilutive stock option, restricted stock and restricted stock unit securities                 1,120,000 1,138,000 1,492,000
Weighted-average number of diluted common shares and equivalents 86,017,000 86,364,000 86,576,000 87,215,000 87,851,000 88,451,000 89,381,000 90,269,000 86,546,000 88,979,000 92,325,000
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]                      
Antidilutive securities excluded from computation of earnings per share                 1,100,000 2,000,000 1,300,000