Quarterly report pursuant to Section 13 or 15(d)

Investments in Affiliated Companies - Summarized Income Statement (Details)

v3.19.2
Investments in Affiliated Companies - Summarized Income Statement (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Equity Method Investment, Summarized Financial Information        
Sales $ 89,938 $ 108,898 $ 158,032 $ 197,474
Gross profit 35,137 40,669 54,551 76,191
Operating income 27,052 31,622 36,259 57,663
Net income $ 27,910 $ 30,638 $ 37,150 $ 57,660