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Product Warranties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Product Warranty Liability [Line Items]      
Standard Product Warranty Accrual Beginning $ 20,975 $ 24,246 $ 33,827
Standard Product Warranty Accrual, Warranties Issued 9,962 16,705 14,463
Standard Product Warranty Accrual, Payments (12,666) (19,976) (24,044)
Standard Product Warranty Accrual ending $ 18,271 $ 20,975 24,246
Escrow Settlement     $ (5,003)