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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Amount | $ 399,537 | $ 1,084,824
Percent | 100.00% | 100.00%
Contract Type Fixed price [Member] |  |
Amount | $ 214,497 | $ 550,756
Percent | 53.70% | 50.80%
Contract Type Unit Price [Member] |  |
Amount | $ 57,007 | $ 169,372
Percent | 14.30% | 15.60%
Contract Type T&E [Member] |  |
Amount | $ 85,951 | $ 252,768
Percent | 21.50% | 23.30%
Contract Type Other [Member] |  |
Amount | $ 42,082 | $ 111,928
Percent | 10.50% | 10.30%
T&D [Member] |  |
Amount | $ 222,531 | $ 635,842
Percent | 100.00% | 100.00%
T&D [Member] | Contract Type Fixed price [Member] |  |
Amount | $ 82,058 | $ 238,723
Percent | 36.90% | 37.50%
T&D [Member] | Contract Type Unit Price [Member] |  |
Amount | $ 42,751 | $ 130,058
Percent | 19.20% | 20.50%
T&D [Member] | Contract Type T&E [Member] |  |
Amount | $ 76,520 | $ 224,938
Percent | 34.40% | 35.40%
T&D [Member] | Contract Type Other [Member] |  |
Amount | $ 21,202 | $ 42,123
Percent | 9.50% | 6.60%
C&I [Member] |  |
Amount | $ 177,006 | $ 448,982
Percent | 100.00% | 100.00%
C&I [Member] | Contract Type Fixed price [Member] |  |
Amount | $ 132,439 | $ 312,033
Percent | 74.80% | 69.50%
C&I [Member] | Contract Type Unit Price [Member] |  |
Amount | $ 14,256 | $ 39,314
Percent | 8.10% | 8.80%
C&I [Member] | Contract Type T&E [Member] |  |
Amount | $ 9,431 | $ 27,830
Percent | 5.30% | 6.20%
C&I [Member] | Contract Type Other [Member] |  |
Amount | $ 20,880 | $ 69,805
Percent | 11.80% | 15.50%

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