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Guarantees (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Guarantees [Abstract]      
Standard warranty period (in years) 1 year    
Movement in Standard Product Warranty Accrual [Roll Forward]      
Beginning balance $ 1,954 $ 2,509 $ 2,286
Provision for warranties 3,432 2,967 3,836
Claims made (3,636) (3,522) (3,613)
Ending balance $ 1,750 $ 1,954 $ 2,509