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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net Sales $ 709,699 $ 650,598 $ 608,286 $ 539,674 $ 673,535 $ 604,154 $ 582,057 $ 535,701 $ 2,508,257 $ 2,395,447 $ 2,485,983
Gross profit 418,610 369,494 347,576 299,907 390,747 339,529 322,912 298,805 1,435,587 1,351,993 1,358,750
Net earnings $ 137,776 $ 101,332 $ 79,588 $ 65,674 $ 123,351 $ 88,861 $ 77,557 $ 63,051 $ 384,370 $ 352,820 $ 338,241
Basic earnings per common share:                      
Net earnings $ 5.27 $ 3.84 $ 2.99 $ 2.44 $ 4.53 $ 3.23 $ 2.79 $ 2.24 $ 14.49 $ 12.75 $ 11.71
Weighted average number of common shares 26,139,024 26,375,468 26,631,015 26,931,293 27,228,026 27,547,734 27,843,905 28,115,220 26,517,768 27,680,918 28,890,771
Diluted earnings per common share:                      
Net earnings $ 5.17 $ 3.77 $ 2.93 $ 2.40 $ 4.44 $ 3.16 $ 2.73 $ 2.19 $ 14.22 $ 12.48 $ 11.44
Weighted average number of common and common equivalent shares 26,631,269 26,888,810 27,143,284 27,421,019 27,755,045 28,113,287 28,460,336 28,762,935 27,023,905 28,269,615 29,571,308
Market price per share:                      
Common Stock Value During The Period Maximum $ 429.91 $ 419.83 $ 385.50 $ 347.09 $ 345.75 $ 346.92 $ 343.44 $ 331.84      
Common Stock Value During The Period Mimimum $ 397.73 $ 363.19 $ 347.76 $ 298.14 $ 283.27 $ 277.62 $ 317.01 $ 289.09