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, 2019
Mar. 31, 2018
Equity Method Investment, Summarized Financial Information    
Sales $ 68,094 $ 88,576
Gross profit 19,414 35,522
Operating income 9,207 26,041
Net income $ 9,240 $ 27,022