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Product Warranty Obligations (Tables)
 3 Months Ended
Mar. 31, 2013
Product Warranty Obligations [Abstract]  
Changes in product warranty obligation
Changes in product warranty obligations are as follows:
 
   
For the three months ended March 31,
 
   
2013
  2012 
Balance at beginning of period
 $49,585  $34,380 
Payments, net of extended warranty receipts
  (3,556)  (4,452)
Charged to operations
  9,220   9,151 
Balance at end of period
 $55,249  $39,079 
Product warranty obligations included in consolidated balance sheets
The product warranty obligations are included in the condensed consolidated balance sheets as follows:
 
   
March 31,
  
December 31,
 
   
2013
  
2012
 
Other accrued liabilities
 $33,242  $28,752 
Other long-term liabilities
  22,007   20,833 
Balance at end of period
 $55,249  $49,585