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Product Warranties (Tables)
6 Months Ended
Jun. 30, 2015
Product Warranties [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, 2014
$
24,246

Warranty expense
7,497

Warranty usage
(10,979
)
Balance at June 30, 2015
$
20,764