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Share Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Disclosure of Liability Classified Plans | Liability Classified Plans
|  | Restricted Share Units |  | Performance Share Units |  | Share Appreciation Rights |  | Non- Management Directors’ DSUs |  | Total |
Balance, December 31, 2016 |  | $ | 15,592 |  | $ | 29,045 |  | $ | 3 |  | $ | 4,602 |  | $ | 49,242 |
Expensed (recovered) during the period |  |  | 2,115 |  |  | (4,188 | ) |  | (3 | ) |  | (1,090 | ) |  | (3,166 | )
Payments |  |  | (10,757 | ) |  | (13,450 | ) |  | — |  |  | — |  |  | (24,207 | )
Balance, December 31, 2017 |  |  | 6,950 |  |  | 11,407 |  |  | — |  |  | 3,512 |  |  | 21,869 |
Expensed during the period |  |  | 5,223 |  |  | 398 |  |  | — |  |  | 769 |  |  | 6,390 |
Payments |  |  | (6,764 | ) |  | (7,284 | ) |  | — |  |  | (1,800 | ) |  | (15,848 | )
Balance, December 31, 2018 |  | $ | 5,409 |  | $ | 4,521 |  | $ | — |  | $ | 2,481 |  | $ | 12,411 |
Current |  | $ | 3,112 |  | $ | 2,779 |  | $ | — |  | $ | — |  | $ | 5,891 |
Long-term |  |  | 2,297 |  |  | 1,742 |  |  | — |  |  | 2,481 |  |  | 6,520 |
|  | $ | 5,409 |  | $ | 4,521 |  | $ | — |  | $ | 2,481 |  | $ | 12,411 |
Summary of Shares Outstanding Under Share Based Incentive Plans | A summary of the RSUs and PSUs outstanding under these share based incentive plans is presented below:
|  | RSUs Outstanding |  |  | PSUs Outstanding |
December 31, 2016 |  |  | 3,129,039 |  |  |  | 6,493,798 |
Granted |  |  | 1,343,669 |  |  |  | 828,400 |
Redeemed |  |  | (1,404,271 | ) |  |  | (1,325,692 | )
Forfeited |  |  | (271,579 | ) |  |  | (270,247 | )
December 31, 2017 |  |  | 2,796,858 |  |  |  | 5,726,259 |
Granted |  |  | 2,918,912 |  |  |  | 1,292,550 |
Redeemed |  |  | (1,404,284 | ) |  |  | (2,137,163 | )
Forfeited |  |  | (255,572 | ) |  |  | (338,656 | )
December 31, 2018 |  |  | 4,055,914 |  |  |  | 4,542,990 |
Summary of Status of Equity Incentive Plan | A summary of the status of the equity incentive plan is presented below:
Canadian Share Options |  | Options Outstanding |  |  | Range of Exercise Prices |  | Weighted Average Exercise Price |  |  | Options Exercisable |
December 31, 2016 |  |  | 6,188,672 |  |  | $ 4.46 – 14.50 |  | $ | 8.70 |  |  |  | 4,369,155 |
Granted |  |  | 377,100 |  |  | 7.30 – 7.30 |  |  | 7.30 |  |  |  |  |
Forfeited |  |  | (1,665,412 | ) |  | 7.32 – 14.50 |  |  | 8.98 |  |  |  |  |
December 31, 2017 |  |  | 4,900,360 |  |  | 4.46 – 14.50 |  |  | 8.50 |  |  |  | 3,734,019 |
Granted |  |  | 490,200 |  |  | 4.35 – 4.35 |  |  | 4.35 |  |  |  |  |
Forfeited |  |  | (657,404 | ) |  | 10.44 – 14.50 |  |  | 10.58 |  |  |  |  |
December 31, 2018 |  |  | 4,733,156 |  |  | $ 4.35 – 14.31 |  | $ | 7.78 |  |  |  | 3,786,473 |
U.S. Share Options |  | Options Outstanding |  |  | Range of Exercise Prices (US$) |  | Weighted Average Exercise Price (US$) |  |  | Options Exercisable |
December 31, 2016 |  |  | 5,337,070 |  |  | $ 3.21 – 15.21 |  | $ | 6.69 |  |  |  | 2,626,326 |
Granted |  |  | 1,165,900 |  |  | 3.99 – 5.57 |  |  | 5.56 |  |  |  |  |
Forfeited |  |  | (944,349 | ) |  | 5.79 – 10.96 |  |  | 8.42 |  |  |  |  |
December 31, 2017 |  |  | 5,558,621 |  |  | 3.21 – 15.21 |  |  | 6.16 |  |  |  | 2,891,808 |
Granted |  |  | 1,569,250 |  |  | 3.44 – 3.62 |  |  | 3.45 |  |  |  |  |
Exercised |  |  | (66,000 | ) |  | 3.21 – 3.21 |  |  | 3.21 |  |  |  |  |
Forfeited |  |  | (996,021 | ) |  | 3.21 – 15.21 |  |  | 8.08 |  |  |  |  |
December 31, 2018 |  |  | 6,065,850 |  |  | $ 3.21 – 10.74 |  | $ | 5.17 |  |  |  | 3,224,078 |
Range of Exercise Prices for Options Outstanding |
Canadian Share Options |  | Total Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices: |  | Number |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Number |  |  | Weighted Average Exercise Price |
$ 4.34 – 6.99 |  |  | 1,105,400 |  |  | $ | 4.41 |  |  |  | 5.04 |  |  |  | 410,122 |  |  | $ | 4.46 |
7.00 – 8.99 |  |  | 1,539,001 |  |  |  | 7.32 |  |  |  | 3.58 |  |  |  | 1,287,596 |  |  |  | 7.33 |
9.00 – 14.31 |  |  | 2,088,755 |  |  |  | 9.90 |  |  |  | 1.12 |  |  |  | 2,088,755 |  |  |  | 9.90 |
$ 4.34 – 14.31 |  |  | 4,733,156 |  |  | $ | 7.78 |  |  |  | 2.83 |  |  |  | 3,786,473 |  |  | $ | 8.43 |
U.S. Share Options |  | Total Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices (US$): |  | Number |  |  | Weighted Average Exercise Price (US$) |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Number |  |  | Weighted Average Exercise Price (US$) |
$ 3.21 – 3.99 |  |  | 3,046,950 |  |  | $ | 3.33 |  |  |  | 5.18 |  |  |  | 995,888 |  |  | $ | 3.21 |
4.00 – 6.99 |  |  | 1,924,500 |  |  |  | 5.61 |  |  |  | 4.37 |  |  |  | 1,133,790 |  |  |  | 5.66 |
7.00 – 10.74 |  |  | 1,094,400 |  |  |  | 9.52 |  |  |  | 1.19 |  |  |  | 1,094,400 |  |  |  | 9.52 |
$ 3.21 – 10.74 |  |  | 6,065,850 |  |  | $ | 5.17 |  |  |  | 4.20 |  |  |  | 3,224,078 |  |  | $ | 6.22 |
Share Appreciation Rights [Member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Summary of Shares Outstanding Under Share Based Incentive Plans |
Share Appreciation Rights |  | Outstanding |  |  | Range of Exercise Price (US$) |  |  | Weighted Average Exercise Price (US$) |  |  | Exercisable |
December 31, 2016 |  |  | 253,376 |  |  | $ 15.22 – 15.79 |  |  | $ | 15.47 |  |  |  | 253,376 |
Forfeited |  |  | (117,207 | ) |  | 15.22 – 17.38 |  |  |  | 15.75 |  |  |  |  |
December 31, 2017 |  |  | 136,169 |  |  | 15.22 – 15.22 |  |  |  | 15.22 |  |  |  | 136,169 |
Forfeited |  |  | (136,169 | ) |  | 15.22 – 15.22 |  |  |  | — |  |  |  |  |
December 31, 2018 |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | — |
Deferred Share Units (DSUs) [Member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Summary of Shares Outstanding Under Share Based Incentive Plans | A summary of the DSUs outstanding under this share based incentive plan is presented below:
Deferred Share Units |  | Outstanding |
Balance December 31, 2016 |  |  | 621,821 |
Granted |  |  | 331,456 |
Balance December 31, 2017 |  |  | 953,277 |
Granted |  |  | 474,766 |
Redeemed |  |  | (374,408 | )
Balance December 31, 2018 |  |  | 1,053,635 |
Deferred Share Units (DSUs) [Member] | Equity-Settled Plans [Member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Summary of Shares Outstanding Under Share Based Incentive Plans | A summary of this share based incentive plan is presented below:
Deferred Share Units |  | Outstanding |
December 31, 2016 and 2017 |  |  | 195,743 |
Redeemed |  |  | (102,570 | )
December 31, 2018 |  |  | 93,173 |
Executive Performance Share Units [Member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Summary of Shares Outstanding Under Share Based Incentive Plans | . A summary of the activity under this share based incentive plan is presented below:
|  | Outstanding |  |  | Weighted Fair Value |
December 31, 2016 |  |  | — |  |  | $ | — |
Granted |  |  | 1,159,000 |  |  |  | 6.00 |
December 31, 2017 |  |  | 1,159,000 |  |  |  | 6.00 |
Granted |  |  | 2,082,800 |  |  |  | 6.22 |
Forfeited |  |  | (50,733 | ) |  |  | 6.12 |
December 31, 2018 |  |  | 3,191,067 |  |  | $ | 6.14 |

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