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Revenue Recognition - Schedule of revenue by market type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Amount	$ 468,094	$ 345,611
Sales Revenue, Net [Member]
Amount	$ 468,094	$ 345,611
Percent	100.00%	100.00%
T&D [Member] | Sales Revenue, Net [Member]
Amount	$ 272,548	$ 216,386
Percent	100.00%	100.00%
T&D [Member] | Market Type Transmission [Member] | Sales Revenue, Net [Member]
Amount	$ 187,765	$ 134,452
Percent	40.10%	38.90%
T&D [Member] | Market Type Distribution [Member] | Sales Revenue, Net [Member]
Amount	$ 84,783	$ 81,934
Percent	18.10%	23.70%
C&I [Member] | Sales Revenue, Net [Member]
Amount	$ 195,546	$ 129,225
Percent	100.00%	100.00%
C&I [Member] | Market Type Electrical construction [Member] | Sales Revenue, Net [Member]
Amount	$ 195,546	$ 129,225
Percent	41.80%	37.40%

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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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