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Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
Jan. 01, 2018
USD ($)
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 $ 965,768   $ 965,768     $ 857,154
Revenue recognition, performance obligations satisfied in previous periods, revenue recognized 5,200   47,400      
Contract with customer, unapproved change orders and/or claims, amount $ 190,000   $ 190,000     $ 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 37.00% 31.00% 38.00% 37.00%    
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 7.00%   8.00%      
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         $ 2,000  
ASU 2016-15 [Member]            
Revenue [Line Items]            
Payments for contingent consideration liabilities, operating activities, reclassification adjustment   $ 12,000