Business Combinations (Details Textual) (USD $) In Thousands, unless otherwise specified							3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Poseidon [Member]	May 01, 2012 Poseidon [Member]	Mar. 31, 2012 Poseidon [Member]	Mar. 31, 2011 Poseidon [Member]	Mar. 31, 2013 Matrix	Apr. 16, 2012 Matrix	Mar. 31, 2012 Matrix	Mar. 31, 2011 Matrix
Business Combinations (Textual) [Abstract]
Purchase Price of business acquisition			$ 2,033	$ 2,533	$ 0	$ 0	$ 5,073	$ 13,841	$ 0	$ 0
Period for contingent consideration payable							18 months
Fair value of contingent consideration	5,336	6,556					(2,862)	2,862	0	0
Maximum contingent consideration								4,000
Accounts Receivable			$ 111				$ 1,287