Business Combination (Details 1) (Meridian [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of potential contingent consideration
Original Range of Potential Undiscounted Payments, Low	$ 0
Original Range of Potential Undiscounted Payments, High	2,750
Maximum Contingent Consideration Due, Total		231	1,300
Maximum [Member]
Summary of potential contingent consideration
Maximum Contingent Consideration Due Next Year	917
Maximum Contingent Consideration Due, Total	$ 917