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Guarantees (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 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 1,633 1,692
Claims made (1,712) (1,770)
Ending balance $ 1,875 $ 2,431