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

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2019

    

2018

Warranty liabilities, balance at January 1,

​

$

52,220

​

$

44,398

Warranty claims

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(99,267)

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(89,557)

Warranty accruals

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108,116

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97,379

Warranty liabilities, balance at December 31,

​

$

61,069

​

$

52,220