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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Equity Method Investment, Summarized Financial Information        
Net sales $ 74,088 $ 83,983 $ 271,562 $ 225,770
Gross profit 24,495 33,276 100,686 91,862
Operating income 14,594 22,713 72,257 60,408
Net income $ 14,545 $ 23,819 $ 72,204 $ 63,663