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Related Party Transactions (Contractual Joint Ventures and Investments) (Narrative) (Details)
CAD in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2017
Jun. 30, 2017
CAD
Jun. 30, 2017
USD ($)
Dec. 31, 2016
CAD
Dec. 31, 2016
USD ($)
Performance Guarantees [Member]                  
Related Party Transaction [Line Items]                  
Guarantees issued, related parties             $ 50,900,000   $ 72,900,000
Joint Venture [Member] | Pacer [Member]                  
Related Party Transaction [Line Items]                  
Proportionately consolidated non-controlled joint venture, ownership percentage           35.00% 35.00%    
Joint Venture [Member] | Pacer [Member] | Performance Guarantees [Member]                  
Related Party Transaction [Line Items]                  
Guarantees issued, related parties | CAD           CAD 132.1   CAD 132.1  
Joint Venture [Member] | Pacer [Member] | Canadian Dollars [Member]                  
Related Party Transaction [Line Items]                  
Revenue, related party $ 200,000 $ 300,000 $ 300,000 $ 600,000          
Joint Venture [Member] | Pacer [Member] | Canadian Dollars [Member] | Financing Support [Member]                  
Related Party Transaction [Line Items]                  
Payments to affiliate, related party 2,300,000 $ 1,400,000 $ 3,100,000 $ 4,900,000          
Amounts committed, related party             $ 0    
Joint Venture [Member] | Pacer [Member] | Canadian Dollars [Member] | Performance Guarantees [Member]                  
Related Party Transaction [Line Items]                  
Guarantees issued, related parties             101,900,000   98,300,000
Joint Venture [Member] | Pacer [Member] | Canadian Dollars [Member] | Accounts Receivable [Member]                  
Related Party Transaction [Line Items]                  
Receivables, related party             800,000   $ 700,000
Equity Investees [Member] | April 2017 Acquisition [Member]                  
Related Party Transaction [Line Items]                  
Receivables, related party             $ 300,000    
Payments to affiliate, related party 300,000                
Equity method investment, ownership percentage           40.00% 40.00%    
Net investment, equity investees             $ 400,000    
Equity Investees [Member] | April 2017 Acquisition [Member] | Subcontracting Arrangements [Member]                  
Related Party Transaction [Line Items]                  
Payments, related party 200,000                
Payables, related party             100,000    
Management [Member] | April 2017 Acquisition [Member] | Financing Arrangements [Member]                  
Related Party Transaction [Line Items]                  
Payables, related party             1,400,000    
Financing arrangement payments, related party $ 3,800,000                
Chief Executive Officer [Member] | Plan [Member]                  
Related Party Transaction [Line Items]                  
Cost method investment, ownership percentage         4.00%        
Chief Executive Officer [Member] | Cost-method Investments [Member]                  
Related Party Transaction [Line Items]                  
Amounts committed, related party             $ 2,000,000