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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Equity Method Investment, Summarized Financial Information        
Net sales $ 83,983 $ 63,110 $ 225,770 $ 107,897
Gross profit 33,276 24,283 91,862 46,589
Operating income 22,713 15,054 60,408 30,708
Net income $ 23,819 $ 15,351 $ 63,663 $ 30,994