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Revenue Recognition (Details 1) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Revenues	$ 399,537	$ 1,084,824
Concentration Risk, Percentage	100.00%	100.00%
T&D [Member]
Revenues	$ 222,531	$ 635,842
Concentration Risk, Percentage	100.00%	100.00%
T&D [Member] | Market Type Transmission [Member]
Revenues	$ 121,619	$ 377,780
Concentration Risk, Percentage	30.40%	34.80%
T&D [Member] | Market Type Distribution [Member]
Revenues	$ 100,912	$ 258,062
Concentration Risk, Percentage	25.30%	23.80%
C&I [Member]
Revenues	$ 177,006	$ 448,982
Concentration Risk, Percentage	100.00%	100.00%
C&I [Member] | Market Type Electrical Construction [Member]
Revenues	$ 177,006	$ 448,982
Concentration Risk, Percentage	44.30%	41.40%

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.

+ References

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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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