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Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Mar. 31, 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 $ 885,277       $ 857,154
Revenue recognition, performance obligations satisfied in previous periods, revenue recognized 44,300        
Contract with customer, unapproved change orders and/or claims, amount $ 280,000       $ 146,000
Maximum [Member]          
Revenue [Line Items]          
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 months/years) 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 41.00%   46.00%    
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] | Pro Forma [Member]          
Revenue [Line Items]          
Payments for contingent consideration liabilities, operating activities   $ 12,000