Business Combinations (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended		0 Months Ended	9 Months Ended			0 Months Ended				0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Mar. 12, 2012 Sprint	Sep. 30, 2013 Sprint	Sep. 30, 2012 Sprint	Mar. 12, 2012 Sprint 2012 earnout target	Mar. 12, 2012 Sprint 2012 earnout target Minimum	Sep. 30, 2013 Sprint 2013 earnout target	Dec. 31, 2012 Sprint 2013 earnout target	Mar. 12, 2012 Sprint 2013 earnout target	Mar. 12, 2012 Sprint 2013 earnout target Minimum
2012 Acquisition - Sprint Pipeline Services, L.P.
Total consideration			$ 28,377
Cash paid for acquisitions	2,273	38,110	21,197		21,197
Company common stock as a part of consideration			980
Number of shares of common stock issued			62,052	62,052
Contingent consideration			6,200					3,300	3,020	2,745
Pretax income threshold for measuring financial performance							7,000				7,750
Contingent consideration in cash						$ 4,000				$ 4,000