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Product Warranty Obligations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Changes in product warranty obligations [Roll Forward]          
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 expense adjustment (5,600)   (12,300)    
Product warranty obligations included in consolidated balance sheets [Abstract]          
Other accrued liabilities 36,709   36,709   28,752
Other long-term liabilities 21,150   21,150   20,833
Balance at end of period $ 57,859 $ 46,121 $ 57,859 $ 46,121