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Warranties (Tables)
12 Months Ended
Dec. 31, 2019
Warranties  
Product warranty liabilities

    

2019

    

2018

Warranty liabilities, balance at January 1,

$

52,220

$

44,398

Warranty claims

 

(99,267)

 

(89,557)

Warranty accruals

 

108,116

 

97,379

Warranty liabilities, balance at December 31,

$

61,069

$

52,220