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Operations by Business Segment and Geographic Area - Depreciation and Amortization of Fixed Assets and Capital Expenditures (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Depreciation and amortization of fixed assets      
Total depreciation and amortization of fixed assets $ 188,700 $ 191,701 $ 206,331
Capital expenditures      
Total capital expenditures 240,220 324,704 288,487
Corporate and other      
Depreciation and amortization of fixed assets      
Total depreciation and amortization of fixed assets 68,100 70,300 76,500
Capital expenditures      
Total capital expenditures 71,300 88,100 134,900
Industrial and Infrastructure Segment | Reportable segments      
Depreciation and amortization of fixed assets      
Total depreciation and amortization of fixed assets 1,500 2,600 1,500
Capital expenditures      
Total capital expenditures   8,300 2,900
Government Segment | Reportable segments      
Depreciation and amortization of fixed assets      
Total depreciation and amortization of fixed assets 3,200 5,400 9,500
Capital expenditures      
Total capital expenditures 3,900 2,200 4,100
Global Services Segment | Reportable segments      
Depreciation and amortization of fixed assets      
Total depreciation and amortization of fixed assets 113,400 111,800 117,700
Capital expenditures      
Total capital expenditures 158,900 224,000 145,300
Power Segment | Reportable segments      
Depreciation and amortization of fixed assets      
Total depreciation and amortization of fixed assets 2,500 1,600 1,100
Capital expenditures      
Total capital expenditures $ 6,100 $ 2,100 $ 1,300