Quarterly report pursuant to Section 13 or 15(d)

Summarized Income Statement (Details)

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Summarized Income Statement (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Equity Method Investment, Summarized Financial Information    
Sales $ 71,207 $ 68,094
Gross profit 31,139 19,414
Operating income 21,009 9,207
Net income $ 20,035 $ 9,240