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Guarantees (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Guarantees [Abstract]    
Standard warranty period (in years) 1 year  
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 1,954 $ 2,509
Provision for warranties 2,533 2,380
Claims made (2,653) (2,653)
Ending balance $ 1,834 $ 2,236