Product Warranty (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Standard Product Warranty Period [Line Items]
Product warranty liability	$ 549	$ 593
Minimum [Member]
Standard Product Warranty Period [Line Items]
Standard product warranty period	90 days
Maximum [Member]
Standard Product Warranty Period [Line Items]
Standard product warranty period	3 years