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Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
Jun. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]              
Number of reportable segments | segment       5      
Revenue [Line Items]              
Retained earnings, cumulative effect recognized on intial application of the new guidance (in dollars) $ 1,086,434     $ 1,086,434     $ 857,154
Revenue recognition, performance obligations satisfied in previous periods, revenue recognized (in dollars) 72,700     55,600      
Contract with customer, unapproved change orders and/or claims, amount (in dollars) $ 56,000     $ 56,000     $ 146,000
Maximum [Member]              
Revenue [Line Items]              
Revenue recognition, changes In contract estimates, cost-to-cost method, financial effect, percentage       5.00% 5.00%    
Change order or claim approval process, term within which expected to be completed (in years)       1 year      
Maximum [Member] | Plan [Member]              
Revenue [Line Items]              
Revenue recognition, performance obligations, completion period (in years) 1 year     1 year      
Revenue [Member] | Concentration Risk from Type of Arrangement [Member] | Master Service and Other Service Agreements [Member]              
Revenue [Line Items]              
Concentration risk, percentage of total 32.00% 32.00%   36.00% 35.00%    
Revenue [Member] | Concentration Risk from Type of Arrangement [Member] | Master Service and Other Service Agreements [Member] | Point in Time [Member]              
Revenue [Line Items]              
Concentration risk, percentage of total 6.00%     7.00%      
ASU 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]              
Revenue [Line Items]              
Retained earnings, cumulative effect recognized on intial application of the new guidance (in dollars)           $ 2,000  
ASU 2016-15 [Member]              
Revenue [Line Items]              
Payments for contingent consideration liabilities, operating activities, reclassification adjustment (in dollars)     $ 12,000