Business Combinations (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 Matrix Acquisition [Member]	Apr. 16, 2012 Matrix Acquisition [Member]	Dec. 31, 2012 Matrix Acquisition [Member] Noncompete Agreements [Member]	Dec. 31, 2012 Poseidon Acquisition [Member]	May 02, 2012 Poseidon Acquisition [Member]	Dec. 31, 2012 Poseidon Acquisition [Member] Noncompete Agreements [Member]
Purchase price details
Cash paid	$ 5,073			$ 2,033
Purchase price holdback	853			500
Common stock issued at fair value	3,953			0
Contingent consideration	2,862			0
Intangible assets acquired			1,100			0
Total purchase price	$ 13,841	$ 13,841		$ 2,533	$ 2,533