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Product Warranty Obligations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Changes in product warranty obligations [Roll Forward]      
Balance at beginning of period $ 33,734 $ 36,112  
Payments (6,723) (5,694)  
Provision for warranties issued 6,039 10,989  
Charged to operations (1,143) (1,200)  
Balance at end of period 31,907 40,207  
Deferred revenue related to extended warranty coverage [Roll Forward]      
Balance at beginning of year 23,092 13,473  
Deferred revenue on extended warranty contracts sold 2,219 2,138  
Amortization of deferred revenue on extended warranty contracts (679) (569)  
Balance at end of year 24,632 15,042  
Product warranty obligations included in consolidated balance sheets [Abstract]      
Current portion - other accrued liabilities 24,253   26,080
Long-term portion - other long-term liabilities 7,654   7,654
Total 31,907   33,734
Other accrued liabilities 24,253   26,080
Other long-term liabilities 7,654   7,654
Balance at end of period 31,907 40,207  
Deferred revenue related to extended warranty [Abstract]      
Current portion - other accrued liabilities 4,865   3,325
Long-term portion - other long-term liabilities 19,767   19,767
Total 24,632 15,042  
Product warranty obligations included in consolidated balance sheets [Abstract]      
Current portion - other accrued liabilities 24,253   26,080
Long-term portion - other long-term liabilities 7,654   7,654
Total 31,907   33,734
Other accrued liabilities 24,253   26,080
Other long-term liabilities 7,654   7,654
Balance at end of period $ 31,907 $ 40,207