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Additional Financial Information Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Changes in warranty and after-sale costs reserve        
Balance at beginning of period $ 12,965 $ 6,421 $ 11,617 $ 5,583
Net additions charged to earnings 935 2,077 3,667 4,470
Costs incurred (1,014) (941) (2,398) (2,496)
Balance at end of period $ 12,886 $ 7,557 $ 12,886 $ 7,557