Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Summary of Long-Term Debt

	Year Ended December 31,
	2016 $		2015 $
Revolving credit facilities due through 2021	466,195		530,971
Term loans due through 2021	475,466		635,330
Total principal	941,661		1,166,301
Less: unamortized discount and debt issuance costs	(8,645	)	(1,696	)
Total debt	933,016		1,164,605
Less: current portion	(171,019	)	(174,047	)
Non-current portion of long-term debt	761,997		990,558