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Warranty Costs (Tables)
 6 Months Ended
Jun. 30, 2013
Standard Product Warranty Disclosure [Abstract]  
Product Warranty Liability
During the six and three months ended June 30, 2013 and 2012, changes in the warranty reserve consisted of the following:
 
Six Months
 
Three Months
 
2013
 
2012
 
2013
 
2012
Accrued warranty reserve, beginning of period
$
549

 
$
537

 
$
453

 
$
601

Estimated warranty expense
255

 
319

 
147

 
155

Amounts charged against warranty reserve
(307
)
 
(316
)
 
(103
)
 
(216
)
Accrued warranty reserve, end of period
$
497

 
$
540

 
$
497

 
$
540