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Quarterly Financial Data of the Operating Partnership (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 308,082 | $ 313,634 | $ 313,024 | $ 304,255 | $ 317,036 | $ 307,545 | $ 301,116 | $ 301,695 | $ 1,238,995 | $ 1,227,392 | $ 1,511,473
Total expenses | (252,712) | (263,341) | (258,383) | (260,328) | (267,678) | (265,553) | (258,303) | (258,282) | (1,034,764) | (1,049,816) | (1,346,445)
Equity in net (loss) income from unconsolidated joint ventures | (11,874) | (9,864) | (7,546) | (5,234) | (2,398) | 971 | 4,702 | 4,036 | (34,518) | 7,311 | 21,892
Equity in net gain on sale of interest in unconsolidated joint venture/real estate | 0 | 0 | 59,015 | 17,166 | 167,445 | 70,937 | 72,025 | (6,440) | 76,181 | 303,967 | 16,166
(Loss) gain on sale of real estate, net | (19,241) | 3,541 | 0 | (1,049) | (36,984) | (2,504) | (14,790) | 23,521 | (16,749) | (30,757) | 73,241
Purchase price and other fair value adjustment | 0 | 3,799 | 67,631 | (2,041) | 0 | (3,057) | 11,149 | 49,293 | 69,389 | 57,385 | 0
Depreciable real estate reserves and impairment | 0 | (7,047) | 0 | 0 | (220,852) | (6,691) | 0 | 0 | (7,047) | (227,543) | (178,520)
Gain on sale of investment in marketable securities |  |  |  |  |  |  |  |  | 0 | 0 | 3,262
Loss on early extinguishment of debt |  |  |  |  | (14,889) | (2,194) | 0 | 0 | 0 | (17,083) | 0
Noncontrolling interests and preferred unit distributions | (3,086) | (3,827) | (8,901) | (5,239) | 838 | (7,507) | (8,606) | (8,319) |  |  |
Net income (loss) attributable to SL Green/SLGOP | 21,169 | 36,895 | 164,840 | 47,530 | (57,482) | 91,947 | 107,293 | 105,504 | 270,434 | 247,262 | 101,374
SL Green Operating Partnership |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | 308,082 | 313,634 | 313,024 | 304,255 | 317,036 | 307,545 | 301,116 | 301,695 | 1,238,995 | 1,227,392 | 1,511,473
Total expenses | (252,713) | (263,341) | (258,383) | (260,328) | (267,678) | (265,553) | (258,303) | (258,282) | (1,034,764) | (1,049,816) | (1,346,445)
Equity in net (loss) income from unconsolidated joint ventures | (11,874) | (9,864) | (7,546) | (5,234) | (2,398) | 971 | 4,702 | 4,036 | (34,518) | 7,311 | 21,892
Equity in net gain on sale of interest in unconsolidated joint venture/real estate | 0 | 0 | 59,015 | 17,166 | 167,445 | 70,937 | 72,025 | (6,440) | 76,181 | 303,967 | 16,166
(Loss) gain on sale of real estate, net | (19,241) | 3,541 | 0 | (1,049) | (36,984) | (2,504) | (14,790) | 23,521 | (16,749) | (30,757) | 73,241
Purchase price and other fair value adjustment | 0 | 3,799 | 67,631 | (2,041) | 0 | (3,057) | 11,149 | 49,293 | 69,389 | 57,385 | 0
Depreciable real estate reserves and impairment | 0 | (7,047) | 0 | 0 |  |  |  |  | (7,047) | (227,543) | (178,520)
Gain on sale of investment in marketable securities |  |  |  |  | (220,852) | (6,691) | 0 | 0 | 0 | 0 | 3,262
Loss on early extinguishment of debt |  |  |  |  | (14,889) | (2,194) | 0 | 0 | 0 | (17,083) | 0
Noncontrolling interests and preferred unit distributions | (2,091) | (2,108) | (591) | (2,961) | (2,601) | (2,710) | (3,020) | (3,047) | (14,950) | (14,950) | (14,950)
Net income (loss) attributable to SL Green/SLGOP | 22,163 | 38,614 | 173,150 | 49,808 | (60,921) | 96,744 | 112,879 | 110,776 | 283,735 | 259,478 | 105,369
Perpetual preferred stock dividends | (3,737) | (3,738) | (3,737) | (3,738) | (3,737) | (3,738) | (3,737) | (3,738) |  |  |
Net income attributable to SLGOP common unitholders | $ 18,426 | $ 34,876 | $ 169,413 | $ 46,070 | $ (64,658) | $ 93,006 | $ 109,142 | $ 107,038 | $ 268,785 | $ 244,528 | $ 90,419
Net income attributable to common unitholders per common share—basic (in dollars per share) | $ 0.21 | $ 0.40 | $ 1.94 | $ 0.52 | $ (0.73) | $ 1.03 | $ 1.19 | $ 1.12 | $ 3.10 | $ 2.67 | $ 0.87
Net income attributable to common unitholders per common share—diluted (in dollars per share) | $ 0.21 | $ 0.40 | $ 1.94 | $ 0.52 | $ (0.73) | $ 1.03 | $ 1.19 | $ 1.12 | $ 3.10 | $ 2.67 | $ 0.87

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