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, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]                      
Gross profit $ 49,367 $ 67,669 $ 59,859 $ 47,735 $ 54,425 $ 53,644 $ 38,473 $ 30,119 $ 224,630 $ 176,661 $ 150,953
Operating income 22,002 38,536 27,411 16,436 17,979 22,494 11,652 2,482 104,385 54,607 51,566
Net income $ 25,252 $ 21,325 $ 19,245 $ 7,875 $ 25,435 $ (71,183) $ (1,350) $ (92,518) 73,697 (139,616) (281,704)
Equity method investments                      
Schedule of Equity Method Investments [Line Items]                      
Sales                 306,511 296,416 275,621
Gross profit                 105,693 101,069 88,616
Operating income                 67,169 66,978 53,500
Net income                 $ 68,255 $ 68,433 $ 55,328