Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Long-Term Debt

	December 31, 2017 $		December 31, 2016 $
U.S. Dollar-denominated Revolving Credit Facilities due through 2022	629,667		291,764
Norwegian Kroner Bonds due through 2019	121,889		256,927
U.S. Dollar-denominated Term Loans due through 2021	85,574		112,406
U.S. Dollar-denominated Term Loans due through 2028	1,623,440		2,109,926
U.S. Dollar Non-Public Bonds due through 2024	162,659		166,680
U.S. Dollar Bonds due through 2022	550,000		300,000
Total principal	3,173,229		3,237,703
Less debt issuance costs and other	(49,501	)	(54,809	)
Total debt	3,123,728		3,182,894
Less current portion	(589,767	)	(586,892	)
Long-term portion	2,533,961		2,596,002