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Commitments and Contingencies (Changes To Warranty Liability) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]    
Warranty liabilities, beginning of period $ 65,389us-gaap_StandardProductWarrantyAccrual $ 63,992us-gaap_StandardProductWarrantyAccrual
Reserves provided 8,841us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 8,780us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Payments (16,829)us-gaap_StandardProductWarrantyAccrualPayments (11,075)us-gaap_StandardProductWarrantyAccrualPayments
Other adjustments 0us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease (65)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease
Warranty liabilities, end of period $ 57,401us-gaap_StandardProductWarrantyAccrual $ 61,632us-gaap_StandardProductWarrantyAccrual