Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt [Abstract]

Schedule of Debt

			Carrying amount
			September 30,		December 31,
				2018		2017
Short-term debt			$	10,532	$	7,018
Long-term debt:
	Term Loans (previously referred to as Delayed draw term loans):
		Denominated in Canadian dollars, secured, bearing interest at a weighted
		average rate of 4.015%, due in monthly installments of interest only and
		quarterly installments of principal, maturing in October 2021		173,345		185,143
		Denominated in United States dollars, secured, bearing interest at a weighted
		average rate of 4.219%, due in weekly installments of interest only and
		quarterly installments of principal, maturing in October 2021		92,690		144,544
		Less: unamortized debt issue costs		(2,940)		(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		(11,317)		(12,661)
Total Long-term debt				751,778		812,892
Total debt			$	762,310	$	819,910
Long-term debt:
Current portion			$	11,556	$	16,907
Non-current portion				740,222		795,985
Total long-term debt			$	751,778	$	812,892