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 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Schedule of Equity Method Investments            
Gross profit $ 92,839   $ 115,495   $ 181,438 $ 196,405
Net income 16,247 $ 509 30,719 $ 3,441 16,756 34,160
Equity Method Investment, Nonconsolidated Investee            
Schedule of Equity Method Investments            
Sales 88,161   89,938   159,368 158,032
Gross profit 34,470   35,137   65,609 54,551
Operating income 24,688   27,052   45,697 36,259
Net income $ 26,333   $ 27,910   $ 46,368 $ 37,150