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Revenue Recognition (Details 1) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Revenues	$ 339,676	$ 685,287
Concentration Risk, Percentage	100.00%	100.00%
T&D [Member]
Revenues	$ 196,925	$ 413,311
Concentration Risk, Percentage	100.00%	100.00%
T&D [Member] | Market Type Transmission [Member]
Revenues	$ 121,708	$ 256,161
Concentration Risk, Percentage	35.80%	37.40%
T&D [Member] | Market Type Distribution [Member]
Revenues	$ 75,217	$ 157,150
Concentration Risk, Percentage	22.20%	22.90%
C&I [Member]
Revenues	$ 142,751	$ 271,976
Concentration Risk, Percentage	100.00%	100.00%
C&I [Member] | Market Type Electrical Construction [Member]
Revenues	$ 142,751	$ 271,976
Concentration Risk, Percentage	42.00%	39.70%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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