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Debt Long-term Debt (Details) - Bank of America NA And Other Lenders
Apr. 06, 2016
CAD
Apr. 06, 2016
USD ($)
Apr. 05, 2016
USD ($)
Feb. 29, 2016
CAD
Feb. 29, 2016
USD ($)
Aug. 31, 2015
USD ($)
Senior Secured Revolving Credit Facility | Subsequent Event            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity CAD 15,000,000 $ 335,000,000        
Line of Credit Facility, Additional Borrowing Capacity Available   $ 100,000,000        
Unsecured Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity       CAD 30,000,000 $ 670,000,000  
Long-term Line of Credit         $ 185,000,000 $ 215,000,000
Unsecured Revolving Credit Facility | Subsequent Event            
Debt Instrument [Line Items]            
Long-term Line of Credit     $ 198,000,000      
Minimum | Senior Secured Revolving Credit Facility | Subsequent Event            
Debt Instrument [Line Items]            
Line of Credit Facility, Commitment Fee Percentage 0.20%          
Maximum | Senior Secured Revolving Credit Facility | Subsequent Event            
Debt Instrument [Line Items]            
Line of Credit Facility, Commitment Fee Percentage 0.40%          
Interest Rate Option 1 | Minimum | Senior Secured Revolving Credit Facility | Subsequent Event            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate, Temporary Floor 2.50%          
Interest Rate Option 1 | Minimum | Senior Secured Revolving Credit Facility | Subsequent Event | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 1.75%          
Interest Rate Option 1 | Maximum | Senior Secured Revolving Credit Facility | Subsequent Event | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 2.75%          
Interest Rate Option 2 | Senior Secured Revolving Credit Facility | Subsequent Event | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 1.75%          
Interest Rate Option 2 | Senior Secured Revolving Credit Facility | Subsequent Event | Federal Funds Effective Swap Rate            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 0.50%          
Interest Rate Option 2 | Minimum | Senior Secured Revolving Credit Facility | Subsequent Event | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 0.00%          
Interest Rate Option 2 | Maximum | Senior Secured Revolving Credit Facility | Subsequent Event | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 1.00%