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Share Based Payments (Tables) | 12 Months Ended
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Dec. 31, 2017
Deferred Share Units [member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Schedule of Outstanding and Fair Value of Other Units Activity |
﻿ |  |  |  |  |
﻿ |  | Number of Deferred Share Units |  |  | Fair Value
﻿Outstanding, December 31, 2015 |  | 1,016,416 |  | $ | 2,279
﻿Grants |  | 201,319 |  |  | 781
﻿Units paid out in cash |  | (238,027) |  |  | (1,721)
﻿Units transferred to trade payables |  | (96,640) |  |  | (902)
﻿Change in fair value |  | - |  |  | 4,555
﻿Outstanding, December 31, 2016 |  | 883,068 |  | $ | 4,992
﻿Grants |  | 91,108 |  |  | 429
﻿Change in fair value |  | - |  |  | (327)
﻿Outstanding, December 31, 2017 |  | 974,176 |  | $ | 5,094
﻿
Restricted Share Units [member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Schedule of Outstanding and Fair Value of Other Units Activity |
﻿ |  |  |  |  |
﻿ |  | Number of Restricted Share Units |  |  | Fair Value
﻿Outstanding, December 31, 2015 |  | 1,015,846 |  | $ | 2,179
﻿Grants to executive directors |  | 317,276 |  |  | 1,161
﻿Grants to officers |  | 389,991 |  |  | 1,509
﻿Grants to employees |  | 82,679 |  |  | 323
﻿Units paid out in cash |  | (419,019) |  |  | (2,104)
﻿Forfeited or cancelled |  | (49,053) |  |  | -
﻿Change in fair value and vesting |  | - |  |  | 1,421
﻿Outstanding, December 31, 2016 |  | 1,337,720 |  | $ | 4,489
﻿Grants to officers |  | 406,499 |  |  | 1,919
﻿Grants to employees |  | 38,037 |  |  | 181
﻿Units paid out in cash |  | (406,022) |  |  | (2,114)
﻿Forfeited or cancelled |  | (5,007) |  |  | (5)
﻿Change in fair value and vesting |  | - |  |  | 1,310
﻿Outstanding, December 31, 2017 |  | 1,371,227 |  | $ | 5,780
﻿Less: Equity grants to officers |  | (390,751) |  |  | (1,845)
﻿Cash settled restricted share units, December 31, 2017 |  | 980,476 |  | $ | 3,935
﻿
Performance Share Units [member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Schedule of Outstanding and Fair Value of Other Units Activity | (c) Performance Share Units ﻿
﻿ |  |  |  |  |
﻿ |  | Number of Performance Share Units |  |  | Fair Value
﻿Outstanding, December 31, 2015 |  | 1,236,620 |  | $ | 1,194
﻿Units paid out in cash |  | (247,324) |  |  | (961)
﻿Forfeited or cancelled |  | (103,761) |  |  | -
﻿Change in fair value and vesting |  | - |  |  | 3,312
﻿Outstanding, December 31, 2016 |  | 885,535 |  | $ | 3,545
﻿Units paid out in cash |  | (332,076) |  |  | (1,770)
﻿Change in fair value and vesting |  | - |  |  | 916
﻿Outstanding, December 31, 2017 |  | 553,459 |  | $ | 2,691
﻿

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