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Income Taxes - Income tax losses carried forward (Details) - CAD ($)	Dec. 31, 2017	Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	$ 958,417,000	$ 912,916,000
Unused tax loss carry forward	2,609,070,000
Canada [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	1,261,452,000
United States [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	210,310,000
Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	1,137,308,000
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] | United States [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	20,147,000
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] | United States [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	20,147,000
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	193,385,000
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	171,687,000
Unused tax expiry 2032 [Member] | United States [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	21,698,000
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	321,581,000
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	284,592,000
Unused tax expiry 2033 [Member] | United States [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	36,989,000
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	322,525,000
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	302,121,000
Unused tax expiry 2034 [Member] | United States [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	20,404,000
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	348,967,000
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	334,769,000
Unused tax expiry 2035 [Member] | United States [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	14,198,000
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	211,368,000
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	168,218,000
Unused tax expiry 2036 [Member] | United States [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	43,150,000
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	53,742,000
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	18,000
Unused tax expiry 2037 [Member] | United States [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	53,724,000
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	0
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	0
Unused tax expiry 2038 [Member] | United States [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] | 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	0
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	0
Unused tax expiry 2039 [Member] | United States [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] | Other [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2040 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2040 [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 2040 [Member] | United States [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carry forward	0
Unused tax expiry 2040 [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	1,137,308,000
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] | United States [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	$ 1,137,308,000

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Tax losses that have been incurred and are carried forward for use against future taxable profit.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2016-01-13
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_e&doctype=Standard
-URIDate 2016-03-31

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