Income Tax Expense (Recovery) (Tables)

6 Months Ended

Jun. 30, 2020

Income Tax Disclosure [Abstract]

Components of Provision for Income Tax (Expense) Recovery

The components of the provision for income tax recovery (expense) are as follows:

	Three Months Ended June 30,			Six Months Ended June 30,
	2020	2019		2020	2019
	$	$		$	$
Current	16,408	(3,219	)	12,622	(8,072	)
Deferred	767	(185	)	761	(368	)
Income tax recovery (expense)	17,175	(3,404	)	13,383	(8,440	)

Unrecognized Tax Benefits, Recorded in Other Long-Term Liabilities

	Six Months Ended June 30,
	2020		2019
	$		$
Balance of unrecognized tax benefits as at January 1	62,958		40,556
Increases for positions related to the current year	2,947		2,106
Changes for positions taken in prior years	(13,424	)	4,121
Decrease related to statute limitations	(1,480	)	—
Balance of unrecognized tax benefits as at June 30	51,001		46,783