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Product Warranties (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning Balance Standard Product Warranty Accrual $ 24,246us-gaap_StandardProductWarrantyAccrual
Standard Product Warranty Accrual, Warranties Issued 3,457us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Standard Product Warranty Accrual, Payments (5,373)us-gaap_StandardProductWarrantyAccrualPayments
Ending Balance Standard Product Warranty Accrual $ 22,330us-gaap_StandardProductWarrantyAccrual