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EQUITY (Normal course issuer bid Narrative) (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 21, 2018 | Nov. 01, 2017 | Feb. 17, 2017 | Dec. 31, 2017 | Jan. 01, 2017 | Feb. 23, 2017
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) | 10,960,391 | 16,117,175 |  |  |  | 11,512,267
Number of shares authorized to be repurchased as a percentage of issued and outstanding common shares | 5.00% | 7.00% | 5.00% |  |  |
Number of shares authorized to be repurchased as a percentage of public float |  | 7.20% |  |  |  |
Shares repurchased for cancellation (in shares) |  |  |  | 11,512,267 | 13,775,248 |
Shares repurchased for cancellation |  |  |  | $ 328,616 | $ 394,451 |
TSX |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Maximum shares to be repurchased daily | 114,889 |  |  |  |  |
Average daily trading volume percentage for most recently completed six calendar months | 25.00% |  |  |  |  |
Share capital |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Shares repurchased for cancellation (in shares) |  |  |  | 11,512,000 | 13,775,000 |
Shares repurchased for cancellation |  |  |  | $ 7,692 | $ 8,626 |
Retained earnings |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Shares repurchased for cancellation |  |  |  | $ 320,924 | $ 385,825 |
Other related parties |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Shares repurchased for cancellation (in shares) |  |  |  | 877,000 | 4,025,000 |

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