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Product Warranties (Tables)
 6 Months Ended
Jun. 30, 2013
Product Warranties Disclosures [Abstract]  
Current and Long-term Recorded Warranty Liability
Changes in the Company's current and long-term recorded warranty liability are as follows:
 
2013
Balance at January 1
$
4,269

Current year warranty expense
3,905

Payments made
(4,268
)
Balance as of June 30
$
3,906