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Quarterly Financial Data (Unaudited) (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
Quarterly Net Sales $ 673,535 $ 604,154 $ 582,057 $ 535,701 $ 697,428 $ 629,100 $ 608,834 $ 550,621 $ 2,395,447 $ 2,485,983 $ 2,378,972
Gross profit 390,747 339,529 322,912 298,805 394,382 343,551 328,176 292,641 1,351,993 1,358,750 1,281,931
Net earnings $ 123,351 $ 88,861 $ 77,557 $ 63,051 $ 121,172 $ 84,996 $ 74,022 $ 58,051 $ 352,820 $ 338,241 $ 306,094
Basic earnings per common share:                      
Net earnings $ 4.53 $ 3.23 $ 2.79 $ 2.24 $ 4.27 $ 2.96 $ 2.55 $ 1.98 $ 12.75 $ 11.71 $ 10.22
Weighted average number of common shares 27,228,026 27,547,734 27,843,905 28,115,220 28,398,579 28,732,152 29,074,695 29,370,232 27,680,918 28,890,771 29,945,954
Diluted earnings per common share:                      
Net earnings $ 4.44 $ 3.16 $ 2.73 $ 2.19 $ 4.17 $ 2.89 $ 2.49 $ 1.93 $ 12.48 $ 11.44 $ 9.96
Weighted average number of common and common equivalent shares 27,755,045 28,113,287 28,460,336 28,762,935 29,045,269 29,408,614 29,750,815 30,088,245 28,269,615 29,571,308 30,728,482
Market price per share:                      
Common Stock Value During The Period Maximum $ 345.75 $ 346.92 $ 343.44 $ 331.84 $ 305.89 $ 272.84 $ 253.18 $ 255.85      
Common Stock Value During The Period Mimimum $ 283.27 $ 277.62 $ 317.01 $ 289.09 $ 233.85 $ 249.99 $ 223.80 $ 231.19