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Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]            
Number of reportable segments | segment     5      
Revenue [Line Items]            
Revenue recognition, performance obligations satisfied in previous periods, revenue recognized (in dollars) $ 13,300 $ 72,700 $ 52,200 $ 55,600    
Contract with customer, unapproved change orders and/or claims, amount (in dollars) 26,000   26,000     $ 56,000
Operating Leased Assets [Line Items]            
Operating lease assets 233,423   233,423     $ 0
Operating lease liabilities $ 238,400   $ 238,400      
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      
ASU 2016-02 [Member]            
Operating Leased Assets [Line Items]            
Operating lease assets         $ 230,000  
Operating lease liabilities         $ 230,000  
Revenue Benchmark [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% 35.00% 36.00%    
Revenue Benchmark [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 4.00% 6.00% 5.00% 7.00%