Inventories (Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Inventory Valuation Reserves [Roll Forward]
Balance, beginning of period	$ 755	$ 583	$ 714	$ 579
Provisions for excess and obsolete inventories	18	152	59	156
Inventories written off	0	0	0	0
Balance, end of period	$ 773	$ 735	$ 773	$ 735