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Commitments and Contingencies, Warranties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Warranties [Abstract]      
Warranty expense $ 85,900 $ 94,400 $ 99,100
Changes in product warranties [Roll forward]      
Balance, beginning of period 20,929 24,072  
Liabilities accrued for current year sales 85,850 94,367  
Settlements of warranty claims (87,143) (97,510)  
Balance, end of period $ 19,636 $ 20,929 $ 24,072