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Operations by Business Segment and Geographic Area - Total Assets and Goodwill (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Segment reporting information |  |
Total assets | $ 9,327,692 | $ 9,216,417
Goodwill | 564,683 | 532,239
Energy & Chemicals |  |
Segment reporting information |  |
Goodwill | 12,600 | 12,600
Mining, Industrial, Infrastructure & Power |  |
Segment reporting information |  |
Goodwill | 17,800 | 16,500
Government Segment |  |
Segment reporting information |  |
Goodwill | 58,000 | 58,000
Diversified Services |  |
Segment reporting information |  |
Goodwill | 476,300 | 445,100
Reportable segments | Energy & Chemicals |  |
Segment reporting information |  |
Total assets | 1,674,200 | 2,235,700
Reportable segments | Mining, Industrial, Infrastructure & Power |  |
Segment reporting information |  |
Total assets | 1,067,300 | 862,400
Reportable segments | Government Segment |  |
Segment reporting information |  |
Total assets | 732,000 | 493,700
Reportable segments | Diversified Services |  |
Segment reporting information |  |
Total assets | 2,120,400 | 1,952,700
Corporate and other |  |
Segment reporting information |  |
Total assets | $ 3,733,800 | $ 3,671,900

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