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Revenue Recognition (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2018 were as follows:

		Three months ended June 30, 2018
		T&D								C&I								Total
(in thousands)		Amount				Percent				Amount				Percent				Amount				Percent
Fixed price		$	77,230				39.2	%		$	90,439				63.4	%		$	167,669				49.4	%
Unit Price			41,631				21.1				15,408				10.8				57,039				16.8
T&E			68,073				34.6				8,942				6.3				77,015				22.7
Other			9,991				5.1				27,962				19.5				37,953				11.1
		$	196,925				100.0	%		$	142,751				100.0	%		$	339,676				100.0	%

		Six months ended June 30,  2018
		T&D								C&I								Total
(in thousands)		Amount				Percent				Amount				Percent				Amount				Percent
Fixed price		$	156,665				37.9	%		$	179,594				66.0	%		$	336,259				49.1	%
Unit Price			87,307				21.1				25,058				9.2				112,365				16.4
T&E			148,418				35.9				18,399				6.8				166,817				24.3
Other			20,921				5.1				48,925				18.0				69,846				10.2
		$	413,311				100.0	%		$	271,976				100.0	%		$	685,287				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 six months ended June 30, 2018 were as follows:

		Three months ended June 30,  2018										Six months ended June 30,  2018
(in thousands)		Amount				Percent				Segment		Amount				Percent				Segment
Transmission		$	121,708				35.8	%		T&D		$	256,161				37.4	%		T&D
Distribution			75,217				22.2			T&D			157,150				22.9			T&D
Electrical Construction			142,751				42.0			C&I			271,976				39.7			C&I
Total Revenue		$	339,676				100.0	%				$	685,287				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:

		June 30,				December 31,
(in thousands)		2018				2017				Change
Contract assets		$	87,356			$	78,260			$	9,096
Contract liabilities			(48,407	)			(28,919	)			(19,488	)
Net contract assets (liabilities)		$	38,949			$	49,341			$	(10,392	)

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 June 30, 2018
(In thousands)		Total				Amount estimated to not be recognized within 12 months
T&D		$	406,376			$	53,876
C&I			524,239				128,238
Total		$	930,615			$	182,114

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Tabular disclosure of the revenue by contract type.

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- Definition

Tabular disclosure of contract balances and changes in contract balances.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045

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Tabular disclosure of expected timing for satisfying remaining performance obligation.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

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