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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Amount | $ 339,676 | $ 685,287
Percent | 100.00% | 100.00%
Contract Type Fixed price [Member] |  |
Amount | $ 167,669 | $ 336,259
Percent | 49.40% | 49.10%
Contract Type Unit Price [Member] |  |
Amount | $ 57,039 | $ 112,365
Percent | 16.80% | 16.40%
Contract Type T&E [Member] |  |
Amount | $ 77,015 | $ 166,817
Percent | 22.70% | 24.30%
Contract Type Other [Member] |  |
Amount | $ 37,953 | $ 69,846
Percent | 11.10% | 10.20%
T&D [Member] |  |
Amount | $ 196,925 | $ 413,311
Percent | 100.00% | 100.00%
T&D [Member] | Contract Type Fixed price [Member] |  |
Amount | $ 77,230 | $ 156,665
Percent | 39.20% | 37.90%
T&D [Member] | Contract Type Unit Price [Member] |  |
Amount | $ 41,631 | $ 87,307
Percent | 21.10% | 21.10%
T&D [Member] | Contract Type T&E [Member] |  |
Amount | $ 68,073 | $ 148,418
Percent | 34.60% | 35.90%
T&D [Member] | Contract Type Other [Member] |  |
Amount | $ 9,991 | $ 20,921
Percent | 5.10% | 5.10%
C&I [Member] |  |
Amount | $ 142,751 | $ 271,976
Percent | 100.00% | 100.00%
C&I [Member] | Contract Type Fixed price [Member] |  |
Amount | $ 90,439 | $ 179,594
Percent | 63.40% | 66.00%
C&I [Member] | Contract Type Unit Price [Member] |  |
Amount | $ 15,408 | $ 25,058
Percent | 10.80% | 9.20%
C&I [Member] | Contract Type T&E [Member] |  |
Amount | $ 8,942 | $ 18,399
Percent | 6.30% | 6.80%
C&I [Member] | Contract Type Other [Member] |  |
Amount | $ 27,962 | $ 48,925
Percent | 19.50% | 18.00%

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