Inventories (Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Inventory Valuation Reserves [Roll Forward]
Balance, beginning of period	$ 773	$ 735	$ 714	$ 579
Provisions for excess and obsolete inventories	(35)	67	24	223
Inventories written off	(135)	0	(135)	0
Balance, end of period	$ 603	$ 802	$ 603	$ 802