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Guarantees (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 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 777 833
Claims made (906) (841)
Ending balance $ 1,825 $ 2,501