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Product Warranties (Tables)
6 Months Ended
Jun. 30, 2014
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, 2013
$
33,827

Warranty expense
7,485

Warranty usage
(13,052
)
Balance at June 30, 2014
$
28,260