Inventories (Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Inventory Valuation Reserves [Roll Forward]
Balance, beginning of period	$ 757	$ 714
Provisions for excess and obsolete inventories	137	41
Inventories written off	0	0
Balance, end of period	$ 894	$ 755