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
8 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Equity Method Investment, Summarized Financial Information    
Net sales $ 206,072 $ 317,197
Gross profit 91,761 132,812
Operating income 67,098 91,224
Net income $ 67,332 $ 94,740