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Warranties (Tables)
 9 Months Ended
Sep. 30, 2012
Product Warranties Disclosures [Abstract]  
Changes in accrued product warranties
Changes in product warranty accruals are as follows (in thousands):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2012
 
2011
 
2012
 
2011
Balances at beginning of period
 
$
14,057

 
$
14,296

 
$
14,719

 
$
12,949

Increases to accruals related to sales during the period
 
2,650

 
2,498

 
6,350

 
7,542

Warranty expenditures
 
(1,832
)
 
(2,073
)
 
(6,194
)
 
(5,770
)
Balances at end of period
 
$
14,875

 
$
14,721

 
$
14,875

 
$
14,721