Business Combination (Details) (Meridian [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Meridian [Member]
Summary of changes in contingent consideration
Contingent Consideration Liabilities, Beginning Balance	$ 231	$ 1,300
Contingent Consideration Liabilities, Additions/(Payments)			1,200
Contingent Consideration Liabilities, Changes in Fair Value of Contingent Consideration	(231)	(1,069)	100
Contingent Consideration Liabilities, Ending Balance		$ 231	$ 1,300