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Product Warranties (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning Balance Standard Product Warranty Accrual $ 20,975
Standard Product Warranty Accrual, Warranties Issued 4,199
Standard Product Warranty Accrual, Payments (6,728)
Ending Balance Standard Product Warranty Accrual $ 18,446