Inventories (Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Inventory Valuation Reserves [Roll Forward]
Balance, beginning of period	$ 894	$ 755	$ 757	$ 714
Provisions for excess and obsolete inventories	171	18	308	59
Inventories written off	0	0	0	0
Balance, end of period	$ 1,065	$ 773	$ 1,065	$ 773