Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Details)

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Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Data                      
Net sales $ 639,547 $ 647,289 $ 605,969 $ 491,444 $ 501,401 $ 489,044 $ 474,458 $ 441,363 $ 2,384,249 $ 1,906,266 $ 1,742,850
Gross profit 158,226 161,865 145,041 111,018 122,033 120,839 116,609 101,628 576,152 461,109 400,344
Operating (loss) profit 65,161 66,217 43,681 33,893 49,970 49,562 40,796 (3,463) 208,953 136,864 121,604
Net income $ 38,553 $ 42,658 $ 27,153 $ 26,388 $ 104,991 $ 31,393 $ 23,460 $ (1,710) $ 134,752 $ 158,133 $ 72,606
Basic income per common share:                      
Basic net income per common share $ 1.12 $ 1.22 $ 0.77 $ 0.75 $ 3.00 $ 0.90 $ 0.64 $ (0.05) $ 3.86 $ 4.41 $ 1.93
Diluted income per common share:                      
Diluted net income per common share $ 1.10 $ 1.19 $ 0.76 $ 0.74 $ 2.93 $ 0.88 $ 0.63 $ (0.05) $ 3.78 $ 4.32 $ 1.92