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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2013
Commitments and Contingencies [Abstract]  
Changes in product warranties
The following table provides the changes in our product warranties (in thousands):
 
 
Three Months Ended
 
 
March 31,
 
 
2013
 
 
2012
 
 
 
 
 
 
 
Balance, beginning of period                                                                            
 
$
17,288
 
 
$
13,500
 
Liabilities accrued for current year sales                                                                          
 
 
18,356
 
 
 
15,423
 
Settlements of warranty claims                                                                          
 
 
(16,230
)
 
 
(14,975
)
Balance, end of period                                                                            
 
$
19,414
 
 
$
13,948