Fair Value Measurements and Derivative Instruments Reporting (Narrative) (Details) CAD in Millions	6 Months Ended
	Jun. 30, 2016 CAD item	Jun. 30, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Apr. 30, 2015 CAD	Apr. 30, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis		$ 0	$ 0
Cash equivalents		$ 0	$ 0
Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of interest rate swap agreements | item	2	2
Minimum [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
CDOR exchange rate	3.89	3.89
Maximum [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
CDOR exchange rate	3.92	3.92
BMO Credit Agreement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Value		$ 7,500,000
BMO Credit Agreement [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Line of Credit Facility, Expiration Date	Aug. 15, 2019
Notional Value	CAD 9.7	$ 7,500,000		CAD 9.7	$ 7,500,000
CDOR exchange rate	3.92	3.92