Income Tax Expense (Recovery) (Tables)

6 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

Components of Provision for Income Tax (Expense) Recovery

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	$		$		$		$
Current	(3,219	)	(8,410	)	(8,072	)	(11,221	)
Deferred	(185	)	(336	)	(368	)	(1,642	)
Income tax expense	(3,404	)	(8,746	)	(8,440	)	(12,863	)

Unrecognized Tax Benefits, Recorded in Other Long-Term Liabilities

	Six Months Ended June 30,
	2019	2018
	$	$
Balance of unrecognized tax benefits as at January 1	40,556	31,061
Increases for positions related to the current year	2,106	2,047
Changes for positions taken in prior periods	4,121	2,337
Decrease related to statute limitations	—	(312	)
Balance of unrecognized tax benefits as at June 30	46,783	35,133