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Revenue Recognition - Schedule of revenue by market type (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Amount | $ 448,776 | $ 339,676 | $ 916,870 | $ 685,287
Sales Revenue, Net [Member] |  |  |  |
Amount | $ 448,776 | $ 339,676 | $ 916,870 | $ 685,287
Percent | 100.00% | 100.00% | 100.00% | 100.00%
T&D [Member] | Sales Revenue, Net [Member] |  |  |  |
Amount | $ 255,910 | $ 196,925 | $ 528,458 | $ 413,311
Percent | 100.00% | 100.00% | 100.00% | 100.00%
T&D [Member] | Market Type Transmission [Member] | Sales Revenue, Net [Member] |  |  |  |
Amount | $ 169,466 | $ 121,708 | $ 357,231 | $ 256,161
Percent | 37.80% | 35.80% | 39.00% | 37.40%
T&D [Member] | Market Type Distribution [Member] | Sales Revenue, Net [Member] |  |  |  |
Amount | $ 86,444 | $ 75,217 | $ 171,227 | $ 157,150
Percent | 19.20% | 22.20% | 18.60% | 22.90%
C&I [Member] | Sales Revenue, Net [Member] |  |  |  |
Amount | $ 192,866 | $ 142,751 | $ 388,412 | $ 271,976
Percent | 100.00% | 100.00% | 100.00% | 100.00%
C&I [Member] | Market Type Electrical construction [Member] | Sales Revenue, Net [Member] |  |  |  |
Amount | $ 192,866 | $ 142,751 | $ 388,412 | $ 271,976
Percent | 43.00% | 42.00% | 42.40% | 39.70%

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