Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2018 were as follows:

	Three months ended March 31,  2018
	T&D					C&I					Total
(in thousands)	Amount		Percent			Amount		Percent			Amount		Percent
Fixed price	$	79,435		36.7	%	$	89,155		69.0	%	$	168,590		48.8	%
Unit Price		45,676		21.1			9,650		7.5			55,326		16.0
T&E		80,345		37.1			9,457		7.3			89,802		26.0
Other		10,930		5.1			20,963		16.2			31,893		9.2
	$	216,386		100.0	%	$	129,225		100.0	%	$	345,611		100.0	%

Schedule of Revenue by Market Type [Table Text Block]

The components of the Company’s revenue by market type for the three months ended March 31, 2018 were as follows:

	Three months ended March 31,  2018
(in thousands)	Amount		Percent			Segment
Transmission	$	134,452		38.9	%		T&D
Distribution		81,934		23.7			T&D
Electrical Construction		129,225		37.4			C&I
Total Revenue	$	345,611		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:

	March 31,		December 31,
(in thousands)	2018		2017		Change
Contract assets	$	93,206	$	78,260	$	14,946
Contract liabilities		(18,699)		(28,919)		10,220
Net contract assets (liabilities)	$	74,507	$	49,341	$	25,166

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 March 31, 2018
(In thousands)	Total		Amount estimated to not be recognized within 12 months
T&D	$	359,902	$	57,413
C&I		521,887		149,349
Total	$	881,789	$	206,762