Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Revenue by Contract Type [Table Text Block]

The components of the Company’s revenue by contract type for the three and nine months ended September 30, 2018 were as follows:

	Three months ended September 30, 2018
	T&D					C&I					Total
(in thousands)	Amount		Percent			Amount		Percent			Amount		Percent
Fixed price	$	82,058		36.9	%	$	132,439		74.8	%	$	214,497		53.7	%
Unit Price		42,751		19.2			14,256		8.1			57,007		14.3
T&E		76,520		34.4			9,431		5.3			85,951		21.5
Other		21,202		9.5			20,880		11.8			42,082		10.5
	$	222,531		100.0	%	$	177,006		100.0	%	$	399,537		100.0	%

	Nine months ended September 30, 2018
	T&D					C&I					Total
(in thousands)	Amount		Percent			Amount		Percent			Amount		Percent
Fixed price	$	238,723		37.5	%	$	312,033		69.5	%	$	550,756		50.8	%
Unit Price		130,058		20.5			39,314		8.8			169,372		15.6
T&E		224,938		35.4			27,830		6.2			252,768		23.3
Other		42,123		6.6			69,805		15.5			111,928		10.3
	$	635,842		100.0	%	$	448,982		100.0	%	$	1,084,824		100.0	%

Schedule of Revenue by Market Type [Table Text Block]

The components of the Company’s revenue by market type for the three and nine months ended September 30, 2018 were as follows:

	Three months ended September 30, 2018							Nine months ended September 30, 2018
(in thousands)	Amount		Percent			Segment		Amount		Percent			Segment
Transmission	$	121,619		30.4	%		T&D	$	377,780		34.8	%		T&D
Distribution		100,912		25.3			T&D		258,062		23.8			T&D
Electrical Construction		177,006		44.3			C&I		448,982		41.4			C&I
Total Revenue	$	399,537		100.0	%			$	1,084,824		100.0	%

Contract with Customer, Asset and Liability [Table Text Block]

The following table provides information about receivables, contract assets and contract liabilities from contracts with customers:

	September 30,			December 31,
(in thousands)	2018			2017			Change
Contract assets	$	124,057		$	78,260		$	45,797
Contract liabilities		(46,186	)		(28,919	)		(17,267	)
Net contract assets (liabilities)	$	77,871		$	49,341		$	28,530

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

Management’s Discussion and Analysis of Financial Condition and Results of Operations”.

	Remaining Performance Obligations as of September 30, 2018
(In thousands)	Total		Amount estimated to not be  recognized within 12 months
T&D	$	403,046	$	63,683
C&I		615,575		132,551
Total	$	1,018,621	$	196,234