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SHARE BASED COMPENSATION - Share Unit Plans - (Details) shares in Thousands, EquityInstruments in Thousands | 12 Months Ended
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Dec. 31, 2020 EquityInstruments shares | Dec. 31, 2019 EquityInstruments shares
SHARE BASED COMPENSATION |  |
Vesting period | 3 years |
Performance Share Units (PSUs) |  |
SHARE BASED COMPENSATION |  |
Vesting period | 3 years |
Outstanding, beginning of year | 2,193 | 2,197
Granted | 1,232 | 1,212
Redeemed for cash | shares | (1,086) | (1,210)
Forfeited/expired | shares | (54) | (6)
Outstanding, end of year | 2,285 | 2,193
Performance Share Units (PSUs) | Minimum |  |
SHARE BASED COMPENSATION |  |
Percentage of share price receivable at the time of vesting | 0.00% |
Performance Share Units (PSUs) | Maximum |  |
SHARE BASED COMPENSATION |  |
Percentage of share price receivable at the time of vesting | 200.00% |
Restricted Stock Units (RSUs) |  |
SHARE BASED COMPENSATION |  |
Vesting period | 3 years |
Outstanding, beginning of year | 13,602 | 14,592
Granted | 6,567 | 4,861
Redeemed for cash | shares | (4,707) | (5,577)
Forfeited/expired | shares | (367) | (274)
Outstanding, end of year | 15,095 | 13,602
Deferred Share Units (DSUs) |  |
SHARE BASED COMPENSATION |  |
Outstanding, beginning of year | 1,287 | 1,305
Granted | 289 | 200
Redeemed for cash | shares | (191) | (217)
Forfeited/expired | shares |  | (1)
Outstanding, end of year | 1,385 | 1,287
Director | Deferred Share Units (DSUs) |  |
SHARE BASED COMPENSATION |  |
First increments of share price receivable by executives at the time of vesting | 50.00% |
Second increments of share price receivable by executives at the time of vesting | 100.00% |
Executive Officer | Deferred Share Units (DSUs) |  |
SHARE BASED COMPENSATION |  |
First increments of share price receivable by executives at the time of vesting | 25.00% |
Second increments of share price receivable by executives at the time of vesting | 50.00% |
Third increments of share price receivable by executives at the time of vesting | 75.00% |
Fourth increments of share price receivable by executives at the time of vesting | 100.00% |

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