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Common Shares - Summary Of Phantom Units Activity (Details) - $ / shares | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Earnings Per Share, Basic | $ 0.05 | $ (0.02) | $ 0.03 | $ (0.08) |
Phantom Share Units (PSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unvested, Number of units, beginning of period (in shares) |  |  | 144,000 | 265,000 | 265,000
Cancelled/forfeited, Number of units (in shares) |  |  |  |  | (32,667)
Vested, net of shares withheld, Number of units (in shares) |  |  | (72,000) |  | (88,333)
Unvested, Number of units, end of period (in shares) | 72,000 |  | 72,000 |  | 144,000
Weighted average remaining contractual term |  |  | 9 months |  | 1 year

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