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Product Warranties (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning Balance Standard Product Warranty Accrual $ 33,827
Standard Product Warranty Accrual, Warranties Issued 7,485
Standard Product Warranty Accrual, Payments (13,052)
Ending Balance Standard Product Warranty Accrual $ 28,260