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Guarantees (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Guarantees [Abstract]    
Standard warranty period 1 year  
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 2,286 $ 2,422
Provision for warranties 1,950 1,736
Claims made (1,716) (1,815)
Ending balance $ 2,520 $ 2,343