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Related Party Transactions (Contractual Joint Ventures) (Narrative) (Details)
CAD in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
CAD
Jun. 30, 2016
USD ($)
Dec. 31, 2015
CAD
Dec. 31, 2015
USD ($)
Related Party Transaction [Line Items]                
Total current assets           $ 1,321,842,000   $ 1,129,758,000
Current liabilities           $ 866,434,000   752,535,000
Joint Venture That Provides Infrastructure Construction Services [Member]                
Related Party Transaction [Line Items]                
Proportionately consolidated non-controlled joint venture, ownership percentage         90.00% 90.00%    
Total current assets           $ 6,000,000    
Current liabilities           6,000,000    
Performance Guarantees [Member]                
Related Party Transaction [Line Items]                
Guarantees issued, related parties           $ 141,500,000   539,300,000
Pacer [Member]                
Related Party Transaction [Line Items]                
Proportionately consolidated non-controlled joint venture, ownership percentage         35.00% 35.00%    
Pacer [Member] | Joint Venture [Member] | Performance Guarantees [Member]                
Related Party Transaction [Line Items]                
Guarantees issued, related parties | CAD         CAD 132.1   CAD 132.1  
Pacer [Member] | Joint Venture [Member] | Canadian Dollars [Member]                
Related Party Transaction [Line Items]                
Revenue, related party $ 300,000 $ 900,000 $ 600,000 $ 1,500,000        
Pacer [Member] | Joint Venture [Member] | Canadian Dollars [Member] | Financing Support [Member]                
Related Party Transaction [Line Items]                
Related party, financing provided $ 1,400,000   $ 4,900,000          
Contractual joint venture, outstanding commitments           $ 0    
Pacer [Member] | Joint Venture [Member] | Canadian Dollars [Member] | Performance Guarantees [Member]                
Related Party Transaction [Line Items]                
Guarantees issued, related parties           102,200,000   95,400,000
Pacer [Member] | Joint Venture [Member] | Canadian Dollars [Member] | Accounts Receivable [Member]                
Related Party Transaction [Line Items]                
Receivables, joint venture           $ 900,000   $ 1,200,000