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Product Warranty Obligations (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes in product warranty obligations [Roll Forward]      
Balance at beginning of period $ 36,111 $ 24,643 $ 17,835
Payments (18,484) (19,801) (17,562)
Provision for warranties issued 33,707 34,173 21,356
Changes in estimates for pre-existing warranties (17,600) (2,904) 3,014
Balance at end of period 33,734 36,111 24,643
Deferred revenue related to extended warranty coverage [Roll Forward]      
Balance at beginning of year 13,474 9,737 4,643
Deferred revenue on extended warranty contracts sold 11,998 5,547 6,368
Amortization of deferred revenue on extended warranty contracts (2,380) (1,810) (1,274)
Balance at end of year 23,092 13,474 9,737
Product warranty obligations included in consolidated balance sheets [Abstract]      
Current portion - other accrued liabilities 26,080 26,284  
Long-term portion - other long-term liabilities 7,654 9,827  
Total 33,734 36,111 24,643
Deferred revenue related to extended warranty [Abstract]      
Current portion - other accrued liabilities 3,325 2,468  
Long-term portion - other long-term liabilities 19,767 11,006  
Total $ 23,092 $ 13,474 $ 9,737