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Product Warranty Obligations (Tables)
9 Months Ended
Sep. 30, 2013
Product Warranty Obligations [Abstract]  
Changes in product warranty obligation
Changes in product warranty obligations are as follows:
 
   
For the three months ended September 30,
  
For the nine months ended September 30,
 
   
2013
  
2012
  
2013
  
2012
 
Balance at beginning of period
 $56,885  $41,388  $49,585  $34,380 
Payments, net of extended warranty receipts
  (433)  (3,285)  (5,624)  (10,603)
Charged to operations
  1,407   8,018   13,898   22,344 
Balance at end of period
 $57,859  $46,121  $57,859  $46,121 
Product warranty obligations included in consolidated balance sheets
The product warranty obligations are included in the condensed consolidated balance sheets as follows:
 
   
September 30,
  
December 31,
 
   
2013
  
2012
 
Other accrued liabilities
 $36,709  $28,752 
Other long-term liabilities
  21,150   20,833 
Balance at end of period
 $57,859  $49,585