Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt [Abstract]

Schedule of Debt

			Carrying amount
As at December 31,				2017		2016
Short-term debt			$	7,018	$	23,912
Long-term debt:
	Revolving loans:
		Denominated in Canadian dollars, unsecured, bearing interest at a weighted
		average rate of 2.380%, due in monthly installments of interest only, with the
		committed, revolving credit facility available until October 2021		-		69,926
		Denominated in United States dollars, unsecured, bearing interest at a weighted
		average rate of 2.075%, due in monthly installments of interest only, with the
		committed, revolving credit facility available until October 2021		-		30,000
	Delayed draw term loan:
		Denominated in Canadian dollars, secured, bearing interest at a weighted
		average rate of 3.690%, due in monthly installments of interest only and
		quarterly installments of principal, with the committed credit facility,
		available until October 2021		185,143		-
		Denominated in United States dollars, secured, bearing interest at a weighted
		average rate of 3.662%, due in monthly installments of interest only and
		quarterly installments of principal, with the committed credit facility,
		available until October 2021		144,544		-
		Less: unamortized debt issue costs		(4,134)		-
	Senior unsecured notes:
		Bearing interest at 5.375% due in semi-annual installments, with the full
		amount of principal due in January 2025		500,000		500,000
		Less: unamortized debt issue costs		(12,661)		(4,220)
				812,892		595,706
Total debt			$	819,910	$	619,618
Long-term debt:
Current portion			$	16,907	$	-
Non-current portion				795,985		595,706
			$	812,892	$	595,706

Schedule Of Future Principal Loan Repayments

		Face value
2018	$	16,907
2019		25,360
2020		33,814
2021		253,606
2022		-
Thereafter		500,000
	$	829,687