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Product Warranties (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning Balance Standard Product Warranty Accrual $ 20,975
Standard Product Warranty Accrual, Warranties Issued 1,646
Standard Product Warranty Accrual, Payments (2,965)
Ending Balance Standard Product Warranty Accrual $ 19,656