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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Provisional one-time charge on US tax reform                 $ 71,982 $ 0 $ 0
Cash Tax Portion of the One Time Provisional Transition Tax Charge $ 59,000               59,000    
Net Sales 778,031 $ 698,799 $ 653,656 $ 594,567 $ 709,699 $ 650,598 $ 608,286 $ 539,674 2,725,053 2,508,257 2,395,447
Gross profit 455,219 400,277 374,917 342,900 418,610 369,494 347,576 299,907 1,573,313 1,435,587 1,351,993
Net earnings $ 76,976 $ 104,950 $ 101,580 $ 92,466 $ 137,776 $ 101,332 $ 79,588 $ 65,674 $ 375,972 $ 384,370 $ 352,820
Basic earnings per common share:                      
Net earnings $ 3.01 $ 4.10 $ 3.94 $ 3.57 $ 5.27 $ 3.84 $ 2.99 $ 2.44 $ 14.62 $ 14.49 $ 12.75
Weighted average number of common shares 25,562,542 25,613,433 25,751,374 25,932,112 26,139,024 26,375,468 26,631,015 26,931,293 25,713,575 26,517,768 27,680,918
Diluted earnings per common share:                      
Net earnings $ 2.93 $ 3.99 $ 3.84 $ 3.48 $ 5.17 $ 3.77 $ 2.93 $ 2.40 $ 14.24 $ 14.22 $ 12.48
Weighted average number of common and common equivalent shares 26,229,052 26,303,529 26,439,529 26,586,061 26,631,269 26,888,810 27,143,284 27,421,019 26,393,783 27,023,905 28,269,615
Market price per share:                      
Common Stock Value During The Period Maximum $ 689.11 $ 635.17 $ 601.16 $ 486.90 $ 429.91 $ 419.83 $ 385.50 $ 347.09      
Common Stock Value During The Period Mimimum $ 606.80 $ 571.25 $ 473.87 $ 414.52 $ 397.73 $ 363.19 $ 347.76 $ 298.14