Annual report pursuant to Section 13 and 15(d)

Investments in Affiliated Companies - Summarized Income Statement (Details)

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Investments in Affiliated Companies - Summarized Income Statement (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity Method Investment, Summarized Financial Information      
Net sales $ 352,599 $ 317,197 $ 206,072
Gross profit 126,945 132,812 91,761
Operating income 88,508 91,224 67,098
Net income $ 88,622 $ 94,740 $ 67,332