Segment Information (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

The information in the following table is derived from the segment’s internal financial reports used for corporate management purposes:

	For the Year Ended December 31,
(in thousands)	2015			2014			2013
Contract revenues:
T&D	$	794,898		$	699,595		$	722,387
C&I		266,783			244,372			180,342
	$	1,061,681		$	943,967		$	902,729
Income from operations:
T&D	$	63,155		$	75,439		$	81,413
C&I		13,592			16,542			10,423
General Corporate		(31,906	)		(33,577	)		(36,219	)
	$	44,841		$	58,404		$	55,617

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

Identifiable assets, consisting of contract receivables, costs and estimated earnings in excess of billings on uncompleted contracts, construction materials inventory, goodwill and intangibles for each segment are as follows as of December 31:

(in thousands)	2015		2014
T&D	$	204,309	$	190,105
C&I		92,939		69,640
Other		227,677		260,341
	$	524,925	$	520,086

Schedule Of Segment Reporting Information Related To Allocation Of Depreciation And Amortization By Segment [Table Text Block]

An allocation of total depreciation, including depreciation of shared construction equipment, and amortization to each segment is as follows:

	For the Year Ended December 31,
(in thousands)	2015		2014		2013
Depreciation and amortization
T&D	$	35,456	$	30,957	$	27,545
C&I		2,573		2,466		1,650
	$	38,029	$	33,423	$	29,195