Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Summary of Significant Accounting Policies

Schedule of goodwill by reporting unit

Reporting Unit	Segment	December 31, 2014		December 31, 2013
Rockford	West	$	32,079	$	32,079
Q3C	West	13,160		13,160
JCG (includes JCG Heavy Civil and Infrastructure and Maintenance divisions)	East	42,866		42,866
Cardinal Contractors, Inc.	East	401		401
PES (includes PPS, JCG Industrial, FSSI, Saxon and Surber divisions)	Energy	28,463		27,679
OnQuest Canada, ULC	Energy	2,441		2,441
Total Goodwill		$	119,410	$	118,626

Schedule of the financial impact of the changes in estimates that would have been reflected in the prior years had the revised estimates been applied to the particular year

	Estimated net impact of change in estimate for year the year ended
	2013			2012
Revised estimates in 2014 that impact 2013	$	17,266		$	—
Revised estimates in 2013 that impact 2012	(10,867		)	10,867
Revised estimates in 2012 that impact 2011	—			(8,185		)
Net impact to gross margin	$	6,399		$	2,682
EPS impact to year	$	0.077		$	0.032