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Accrued Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]      
Accrued product warranties, beginning of year $ 18,052 $ 20,845  
Amounts paid for warranty services (3,278) (4,629)  
Warranty provisions for products sold 3,536 3,709  
Currency translation adjustments and other 202 46  
Accrued product warranties, end of year 18,512 19,971  
Current accrued product warranties, end of year 15,319 16,642 $ 15,024
Long-term accrued product warranties, end of ear $ 3,193 $ 3,329