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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, 2019 EquityInstruments shares | Dec. 31, 2018 EquityInstruments shares
SHARE BASED COMPENSATION |  |
Vesting period | 3 years |
Performance Share Units (PSUs) |  |
SHARE BASED COMPENSATION |  |
Vesting period | 3 years |
Outstanding, beginning of year | 2,197 | 2,267
Granted | 1,212 | 1,553
Redeemed for cash | shares | (1,210) | (1,623)
Forfeited/expired | shares | (6) |
Outstanding, end of year | 2,193 | 2,197
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 | 14,592 | 16,072
Granted | 4,861 | 4,796
Redeemed for cash | shares | (5,577) | (5,962)
Forfeited/expired | shares | (274) | (314)
Outstanding, end of year | 13,602 | 14,592
Deferred Share Units (DSUs) |  |
SHARE BASED COMPENSATION |  |
Outstanding, beginning of year | 1,305 | 1,302
Granted | 200 | 192
Redeemed for cash | shares | (217) | (189)
Forfeited/expired | shares | (1) |
Outstanding, end of year | 1,287 | 1,305
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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