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Accounting Changes - Narrative (Details) - CAD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Jan. 01, 2018
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Contract liabilities (Note 5) | $ 87,000 | $ 62,000 |  |  |
Deferred income tax liabilities (Note 11) | 501,000 | 549,000 |  |  |
Non-controlling interests (Note 12) | 1,137,000 | 1,059,000 |  |  |
Deficit | (1,496,000) | (1,209,000) |  |  |
Depreciation and amortization | 574,000 | 635,000 | $ 601,000 |  |
Alberta Mine | Change in Useful Lives Estimate |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Depreciation and amortization | 38,000 | 58,000 |  |  |
Sundance Unit 1 | Change in Useful Lives Estimate |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Depreciation and amortization |  | 26,000 |  |  |
Sundance Unit 2 | Change in Useful Lives Estimate |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Depreciation and amortization | 4,000 |  |  |  |
IFRS 15 |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
IFRS 15 transition adjustment | 17,000 |  |  |  |
Contract liabilities (Note 5) | 87,000 | $ 62,000 |  |  |
Deferred income tax liabilities (Note 11) |  |  |  |  | $ (4,000)
Deficit |  |  |  |  | 13,000
Effect of transition to IFRSs [member] |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Contract liabilities (Note 5) | 19,000 |  |  |  |
Deferred income tax liabilities (Note 11) | (4,000) |  |  |  |
Non-controlling interests (Note 12) |  |  |  |  | $ 1,000
Deficit | $ (15,000) |  |  |  |
Minimum | IFRS 16 [Member] |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Right-of-use assets |  |  |  | $ 42,000 |
Lease liabilities |  |  |  | 42,000 |
Maximum | IFRS 16 [Member] |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Right-of-use assets |  |  |  | 52,000 |
Lease liabilities |  |  |  | $ 52,000 |

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