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Product Warranties (Tables)
3 Months Ended
Mar. 31, 2017
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
The following table represents changes in the Company’s consolidated warranty reserve:
Balance at December 31, 2016
$
18,271

Warranty expense
2,047

Warranty usage
(4,393
)
Balance at March 31, 2017
$
15,925