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Warranties (Tables)
 3 Months Ended
Mar. 31, 2013
Product Warranties Disclosures [Abstract]  
Changes in Product Warranty Liability
Changes in our product warranty liability for continuing operations are as follows:
 
Balance at January 1, 2013
$
364,749

Warranties issued during the period
36,022

Settlements made during the period
(8,889
)
Balance at March 31, 2013
$
391,882