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Debt (Other Credit Facilities) (Narrative) (Details) - Other Credit Facilities [Member]
CAD in Millions, $ in Millions
6 Months Ended
Jun. 30, 2017
CAD
Jun. 30, 2017
USD ($)
Dec. 31, 2016
CAD
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity (in dollars) | CAD CAD 20.0   CAD 40.0  
Debt instrument, rationale for classification as long-term debt Outstanding borrowings that are not renewed are repaid with borrowings under the Company’s senior secured credit facility. Accordingly, the carrying amounts of the Company’s borrowings under its other credit facilities, which are included within notes payable and other debt obligations in the table above, are classified within long-term debt in the Company’s consolidated balance sheets.      
Weighted Average [Member]        
Debt Instrument [Line Items]        
Line of credit facility, interest rate (percentage) 3.50% 3.50% 3.60% 3.60%
Canadian Dollars [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity (in dollars)   $ 15.4   $ 29.8
Long-term debt obligations (in dollars)   $ 7.0   $ 13.4