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Noncontrolling Interests on the Company's Consolidated Financial Statements - Common Unit Activity (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Rollforward Analysis of Preferred Unit Activity |  |  |
Redemption of preferred units | $ (1,536) |  |
SL Green Operating Partnership |  |  |
Rollforward Analysis of Preferred Unit Activity |  |  |
Redemption of preferred units | (1,536) |  |
SL Green Operating Partnership | Preferred Units |  |  |
Rollforward Analysis of Preferred Unit Activity |  |  |
Balance at beginning of period | $ 283,285 | $ 202,169 | $ 283,285
Issuance of preferred units |  | 0 | 0
Redemption of preferred units |  | (3,631) | (82,750)
Dividends paid on preferred units |  | (5,077) | (6,163)
Accrued dividends on preferred units |  | 5,042 | 7,797
Balance at end of period |  | $ 198,503 | $ 202,169

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