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Additional Financial Information Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Changes in warranty and after-sale costs reserve        
Balance at beginning of period $ 12,458 $ 5,981 $ 11,617 $ 5,583
Net additions charged to earnings 1,312 1,232 2,732 2,393
Costs incurred (805) (792) (1,384) (1,555)
Balance at end of period $ 12,965 $ 6,421 $ 12,965 $ 6,421