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Income Taxes - Income tax losses carried forward (Details) - CAD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deferred tax assets | $ 987,639,000 | $ 958,417,000
Unused tax loss carry forward | 2,809,926,000 |
Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 1,436,865,000 |
US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 271,542,000 |
Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 1,101,519,000 |
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 | 21,909,000 |
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 | 21,909,000 |
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 | 260,080,000 |
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 | 236,484,000 |
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 | 23,596,000 |
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 | 339,916,000 |
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 | 299,692,000 |
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 | 40,224,000 |
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 | 344,210,000 |
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 | 322,021,000 |
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 | 22,189,000 |
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 | 379,008,000 |
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 | 363,569,000 |
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 | 15,439,000 |
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 | 256,101,000 |
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 | 209,178,000 |
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 | 46,923,000 |
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 | 35,290,000 |
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 | 35,147,000 |
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 | 71,846,000 |
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 | 5,731,000 |
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 | 66,115,000 |
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 | 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] | US [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] | US [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 | 1,101,519,000 |
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 | $ 1,101,519,000 |

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