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Product Warranty Obligations (Tables)
6 Months Ended
Jun. 30, 2013
Product Warranty Obligations [Abstract]  
Changes in product warranty obligation
Changes in product warranty obligations are as follows:
 
   
For the three months ended June 30,
  
For the six months ended June 30,
 
   
2013
  
2012
  
2013
  
2012
 
Balance at beginning of period
 $55,249  $39,079  $49,585  $34,380 
Payments, net of extended warranty receipts
  (1,635)  (2,866)  (5,191)  (7,318)
Charged to operations
  3,271   5,175   12,491   14,326 
Balance at end of period
 $56,885  $41,388  $56,885  $41,388 
 
Product warranty obligations included in consolidated balance sheets
The product warranty obligations are included in the condensed consolidated balance sheets as follows:
 
   
June 30,
  
December 31,
 
   
2013
  
2012
 
        
Other accrued liabilities
 $34,931  $28,752 
Other long-term liabilities
  21,954   20,833 
Balance at end of period
 $56,885  $49,