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Commitments and Contingencies (Changes To Warranty Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]    
Warranty liabilities, beginning of period $ 91,389 $ 79,154
Reserves provided 15,039 12,262
Payments (18,276) (16,130)
Other adjustments 243 4,461
Warranty liabilities, end of period $ 88,395 $ 79,747