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Product Warranties (Tables)
 3 Months Ended
Mar. 31, 2014
Product Warranties Disclosures [Abstract]  
Warranty Accrual and Cost Activity
Our warranty accrual and cost activity is as follows (in thousands):
 
Three Months Ended
 
March 31,
 
2013
 
2014
Balance, beginning of period
$
4,455

 
$
2,965

Charges to operations
118

 
414

Deductions for payments made
(1,021
)
 
(175
)
Changes in estimates
(809
)
 
40

Balance, end of period
$
2,743

 
$
3,244