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Additional Financial Information Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Changes in warranty and after-sale costs reserve    
Balance at beginning of period $ 5,583 $ 4,206
Net additions charged to earnings 1,161 465
Costs incurred (763) (353)
Balance at end of period $ 5,981 $ 4,318