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Product Warranties (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning Balance Standard Product Warranty Accrual $ 24,246
Standard Product Warranty Accrual, Warranties Issued 7,497
Standard Product Warranty Accrual, Payments (10,979)
Ending Balance Standard Product Warranty Accrual $ 20,764