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
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]                      
Gross profit $ 54,425 $ 53,644 $ 38,473 $ 30,119 $ 37,546 $ 40,831 $ 34,872 $ 37,704 $ 176,661 $ 150,953 $ 167,210
Operating income 17,979 22,494 11,652 2,482 10,993 18,754 9,845 11,974 54,607 51,566 65,967
Net income $ 25,435 $ (71,183) $ (1,350) $ (92,518) $ (306,271) $ 7,812 $ 16,246 $ 509 (139,616) (281,704) 80,310
Equity method investments                      
Schedule of Equity Method Investments [Line Items]                      
Sales                 296,416 275,621 376,372
Gross profit                 101,069 88,616 143,668
Operating income                 66,978 53,500 105,614
Net income                 $ 68,433 $ 55,328 $ 106,683