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Quarterly Results Of Operations (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
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 547,137 $ 554,814 $ 547,483 $ 498,336 $ 402,899 $ 412,370 $ 440,831 $ 422,798 $ 2,147,770 $ 1,678,898 $ 1,403,066
Gross profit 116,793 121,220 131,087 124,014 98,008 105,550 116,904 108,441 493,114 428,903 306,002
Income before income taxes 43,910 47,616 62,626 58,692 40,203 44,742 58,975 55,252 212,844 199,172 114,369
Net income $ 17,464 $ 32,138 $ 40,137 $ 43,145 $ 26,299 $ 29,844 $ 37,569 $ 35,959 $ 132,884 $ 129,671 $ 74,345
Net income per common share, Basic $ 0.70 $ 1.28 $ 1.61 $ 1.73 $ 1.06 $ 1.21 $ 1.52 $ 1.46 $ 5.31 $ 5.26 $ 3.06
Net income per common share, Diluted 0.68 1.26 1.59 1.71 1.05 1.19 1.51 1.45 5.24 5.20 $ 3.02
Stock market price, High 132.73 116.63 106.23 117.15 113.65 103.19 85.38 65.00 132.73 113.65  
Stock market price, Low 104.15 93.08 86.25 94.98 80.65 83.74 60.53 51.67 86.25 51.67  
Close (at end of quarter) $ 130.00 $ 115.85 $ 102.40 $ 99.80 $ 107.75 $ 98.02 $ 84.84 $ 64.46 $ 130.00 $ 107.75