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Real Estate Investments - Co-Investments (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2020 community apartment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) community apartment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | $ 1,018,010 | $ 1,335,339 |  |
Membership Combined Balance Sheets [Abstract] |  |  |  |  |
Rental properties and real estate under development |  | 386,047 | 546,075 |  |
Total assets |  | 12,936,177 | 12,705,405 |  |
Debt |  | 6,720,746 | 6,264,491 |  |
Other liabilities |  | 39,140 | 36,565 |  |
Equity |  | 6,183,192 | 6,403,504 | $ 6,393,844 | $ 6,396,825
Total liabilities and equity/capital |  | 12,936,177 | 12,705,405 |  |
Membership Combined Statements Of Income [Abstract] |  |  |  |  |
Revenues |  | 1,495,748 | 1,460,155 | 1,400,053 |
Interest expense |  | (220,633) | (217,339) | (220,492) |
General and administrative |  | (65,388) | (54,262) | (53,451) |
Net income |  | 599,332 | 464,448 | 413,599 |
Equity income from co-investments |  | 66,512 | $ 112,136 | 89,132 |
Apartment Building |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of communities held by acquired investment | community |  |  | 4 |  |
Number of units held by acquired investment | apartment |  |  | 849 |  |
Total Co Investment |  |  |  |  |
Membership Combined Balance Sheets [Abstract] |  |  |  |  |
Rental properties and real estate under development |  | 4,242,611 | $ 4,733,762 |  |
Other assets |  | 200,777 | 139,562 |  |
Total assets |  | 4,443,388 | 4,873,324 |  |
Debt |  | 2,611,365 | 2,442,213 |  |
Other liabilities |  | 189,515 | 117,160 |  |
Equity |  | 1,642,508 | 2,313,951 |  |
Total liabilities and equity/capital |  | 4,443,388 | 4,873,324 |  |
Company's share of equity |  | 1,018,010 | 1,335,339 |  |
Membership Combined Statements Of Income [Abstract] |  |  |  |  |
Revenues |  | 300,624 | 336,922 | 332,164 |
Property operating expenses |  | (108,682) | (115,658) | (107,584) |
Net operating income |  | 191,942 | 221,264 | 224,580 |
Gain on sale of real estate |  | 0 | 112,918 | 24,218 |
Interest expense |  | (78,962) | (65,665) | (63,913) |
General and administrative |  | (17,079) | (9,575) | (6,379) |
Depreciation and amortization |  | (117,836) | (121,006) | (126,485) |
Net income |  | (21,935) | 137,936 | 52,021 |
Company's share of net income |  | 66,512 | 112,136 | 89,132 |
Investments with Related Parties |  |  |  |  |
Membership Combined Statements Of Income [Abstract] |  |  |  |  |
Equity income from co-investments |  | $ 8,600 | 7,500 | $ 2,000 |
CPPIB |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage |  | 0.00% |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | $ 0 | 345,466 |  |
Wesco I, III, IV and V |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage |  | 51.00% |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | $ 178,322 | 216,756 |  |
BEXAEW, BEX II, BEX III, and BEX IV |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage |  | 50.00% |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | $ 152,309 | 160,888 |  |
Other |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage |  | 47.00% |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | $ 27,635 | 20,351 |  |
Total Operating Co-investments |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | $ 358,266 | 743,461 |  |
Total Development Co-Investments |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage |  | 50.00% |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | $ 157,433 | 146,944 |  |
Total Preferred Interest Investments |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | 502,311 | 444,934 |  |
Total Preferred Interest Investments | Investments in Majority-Owned Subsidiaries |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | $ 81,400 | $ 73,200 |  |
CPPIB Interest |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Investment interest acquired | 45.00% |  |  |  |
CPPIB Interest | Apartment Building |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of communities held by acquired investment | community | 6 |  |  |  |
Number of units held by acquired investment | apartment | 2,020 |  |  |  |

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