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Product Warranties (Tables)
 12 Months Ended
Dec. 31, 2014
Product Warranties Disclosures [Abstract]  
Warranty Accrual and Cost Activity
Our warranty accrual and cost activity is as follows (in thousands):
 
December 31,
 
2012
 
2013
 
2014
Balance, beginning of year
$
6,871

 
$
4,455

 
$
2,965

Charges to operations
2,116

 
1,350

 
1,770

Deductions for payments made
(4,532
)
 
(2,840
)
 
(1,372
)
Balance, end of year
$
4,455

 
$
2,965

 
$
3,363