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Related Party Transactions (Management and Other Transactions) (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
entity
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]                
Payments of acquisition-related contingent consideration           $ 15,929 $ 6,676  
Management [Member] | 2017 Oil and Gas Acquisition [Member]                
Related Party Transaction [Line Items]                
Business combinations, cash paid (in dollars)               $ 40,600
Contingent consideration, earn-out liability   $ 65,700     $ 65,700 65,700    
Payments of acquisition-related contingent consideration     $ 5,700          
Management [Member] | Lease Agreements [Member]                
Related Party Transaction [Line Items]                
Payments, related party   11,800   $ 11,300   30,100 38,400  
Payables, related party   4,700     4,700 4,700   100
Management [Member] | Service Agreements [Member]                
Related Party Transaction [Line Items]                
Payments, related party   22,400   26,400   35,800 41,000  
Payables, related party   37,900     37,900 37,900   5,200
Management [Member] | Equipment [Member]                
Related Party Transaction [Line Items]                
Revenue, related party   700       700    
Receivables, related party   700     700 700    
Management [Member] | Construction Contracts [Member]                
Related Party Transaction [Line Items]                
Revenue, related party   2,500   $ 1,000   $ 8,700 $ 1,000  
Number of entities | entity           2    
Accounts receivable, net of BIEC, related party   300     300 $ 300   $ 200
Immediate Family Member of Management [Member] | Construction Management Firm Specializing in Steel Building Systems [Member]                
Related Party Transaction [Line Items]                
Business combinations, cash paid (in dollars) $ 6,100              
Contingent consideration, earn-out liability   $ 700     700 $ 700    
Business combinations, liabilities assumed, notes payable $ 2,600              
Repayments of notes payable         $ 2,600