Quarterly report pursuant to Section 13 or 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
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Equity Method Investment, Summarized Financial Information    
Net sales $ 88,576 $ 73,055
Gross profit 35,522 28,925
Operating income 26,041 18,583
Net income $ 27,022 $ 19,035