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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Data                      
Net sales $ 662,349 $ 682,330 $ 660,112 $ 619,330 $ 639,547 $ 647,289 $ 605,969 $ 491,444 $ 2,624,121 $ 2,384,249 $ 1,906,266
Gross profit 171,319 179,331 174,922 155,695 158,226 161,865 145,041 111,018 681,267 576,152 461,109
Operating profit 76,421 80,445 76,039 56,618 65,161 66,217 43,681 33,893 289,523 208,953 136,864
Net income $ 45,985 $ 54,976 $ 52,051 $ 37,983 $ 38,553 $ 42,658 $ 27,153 $ 26,388 $ 190,995 $ 134,752 $ 158,133
Basic net income per common share $ 1.38 $ 1.63 $ 1.53 $ 1.11 $ 1.12 $ 1.22 $ 0.77 $ 0.75 $ 5.65 $ 3.86 $ 4.41
Diluted net income per common share $ 1.36 $ 1.60 $ 1.51 $ 1.09 $ 1.10 $ 1.19 $ 0.76 $ 0.74 $ 5.56 $ 3.78 $ 4.32