Inventory (Changes in Inventory Reserve) (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Inventory Valuation Reserve [Member]	Dec. 31, 2012 Inventory Valuation Reserve [Member]	Dec. 31, 2011 Inventory Valuation Reserve [Member]
Change in the reserve for excess and obsolete inventory
Balance, beginning of year	$ 2,679	$ 2,633	$ 2,752	$ 2,679
Charged to costs and expenses			1,330	882	1,011
Deductions			(1,338)	(809)	(965)
Balance, end of the year	$ 2,679	$ 2,633	$ 2,744	$ 2,752	$ 2,679