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Noncontrolling Interests on the Company's Consolidated Financial Statements - Common Unit Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Rollforward Analysis of Preferred Unit Activity |  |  |  |  |  |
Redemption of preferred units | $ 0 | $ (54) | $ (1,536) | $ (25,791) |  |
SL Green Operating Partnership |  |  |  |  |  |
Rollforward Analysis of Preferred Unit Activity |  |  |  |  |  |
Redemption of preferred units | 0 | $ (54) | (1,536) | (25,791) |  |
SL Green Operating Partnership | Preferred Units |  |  |  |  |  |
Rollforward Analysis of Preferred Unit Activity |  |  |  |  |  |
Balance at beginning of period |  |  | $ 283,285 | $ 300,427 | $ 283,285 | $ 300,427
Issuance of preferred units |  |  |  |  | 0 | 1,000
Redemption of preferred units |  |  |  |  | (82,750) | (18,142)
Accrued dividends on preferred units |  |  |  |  | 1,634 | 0
Balance at end of period | $ 202,169 |  |  |  | $ 202,169 | $ 283,285

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