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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, 2018 EquityInstruments shares | Dec. 31, 2017 EquityInstruments shares
Share based compensation |  |
Vesting period | 3 years |
Performance Share Units (PSUs) |  |
Share based compensation |  |
Vesting period | 3 years |
Outstanding, beginning of year | 2,267 | 2,413
Granted | 1,553 | 1,570
Redeemed for cash | shares | (1,623) | (1,663)
Forfeited/expired | shares |  | (53)
Outstanding, end of year | 2,197 | 2,267
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 | 16,072 | 18,158
Granted | 4,796 | 5,009
Redeemed for cash | shares | (5,962) | (6,354)
Forfeited/expired | shares | (314) | (741)
Outstanding, end of year | 14,592 | 16,072
Deferred Share Units (DSUs) |  |
Share based compensation |  |
Outstanding, beginning of year | 1,302 | 1,218
Granted | 192 | 202
Redeemed for cash | shares | (189) | (118)
Outstanding, end of year | 1,305 | 1,302
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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