Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Summary of Long-Term Debt

	As at		As at
	September 30, 2018		December 31, 2017
	$		$
Revolving Credit Facilities due through 2022	465,763		539,735
Term Loans due through 2021	348,946		423,512
Total principal	814,709		963,247
Less: unamortized discount and debt issuance costs	(7,631	)	(10,945	)
Total debt	807,078		952,302
Less: current portion	(103,843	)	(166,745	)
Non-current portion of long-term debt	703,235		785,557