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Income Taxes - Income tax losses carried forward (Details) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	$ 1,048,264,000	$ 987,639,000
Unused tax loss carry forward	2,509,669,000
Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	1,090,440,000
US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	288,034,000
Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	1,131,195,000
Unused tax expiry 2026 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	80,000,000
Unused tax expiry 2026 [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2026 [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2026 [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	80,000,000
Unused tax expiry 2030 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	47,000
Unused tax expiry 2030 [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	47,000
Unused tax expiry 2030 [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2030 [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2031 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	20,859,000
Unused tax expiry 2031 [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2031 [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	20,859,000
Unused tax expiry 2031 [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2032 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	22,736,000
Unused tax expiry 2032 [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	272,000
Unused tax expiry 2032 [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	22,464,000
Unused tax expiry 2032 [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2033 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	211,987,000
Unused tax expiry 2033 [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	173,691,000
Unused tax expiry 2033 [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	38,296,000
Unused tax expiry 2033 [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2034 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	343,484,000
Unused tax expiry 2034 [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	322,359,000
Unused tax expiry 2034 [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	21,125,000
Unused tax expiry 2034 [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2035 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	387,257,000
Unused tax expiry 2035 [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	372,558,000
Unused tax expiry 2035 [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	14,699,000
Unused tax expiry 2035 [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2036 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	253,939,000
Unused tax expiry 2036 [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	209,265,000
Unused tax expiry 2036 [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	44,674,000
Unused tax expiry 2036 [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2037 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	33,605,000
Unused tax expiry 2037 [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	143,000
Unused tax expiry 2037 [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	33,462,000
Unused tax expiry 2037 [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2038 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	57,477,000
Unused tax expiry 2038 [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	5,581,000
Unused tax expiry 2038 [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	51,896,000
Unused tax expiry 2038 [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2039 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	47,083,000
Unused tax expiry 2039 [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	6,524,000
Unused tax expiry 2039 [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	40,559,000
Unused tax expiry 2039 [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry No expiry [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	1,051,195,000
Unused tax expiry No expiry [Member] | Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry No expiry [Member] | US [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry No expiry [Member] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	$ 1,051,195,000

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2019-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2019-03-27

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