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Product Warranty (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Activity for accrued warranty expense        
Balance at beginning of period $ 3,764 $ 3,595 $ 3,526 $ 3,345
Provision 1,234 1,527 2,320 2,798
Claims paid/costs incurred (1,226) (1,344) (2,127) (2,374)
Foreign currency translation 7 6 60 15
Balance at end of period $ 3,779 $ 3,784 $ 3,779 $ 3,784
Maximum        
Product Warranty Liability [Line Items]        
Product Warranty     2 years  
Minimum        
Product Warranty Liability [Line Items]        
Product Warranty     1 year