Inventories (Allowance) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Inventory Valuation Reserves [Roll Forward]
Balance, beginning of period	$ 579	$ 363
Provisions for excess and obsolete inventories	4	196
Inventories written off	0	(27)
Balance, end of period	$ 583	$ 532