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Debt - Summary of Consolidated Indebtedness (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,796,209 | $ 1,770,054
Net unamortized debt issuance costs | (8,781) | (6,763)
Unamortized premium | 471 | 548
Mortgage and other notes payable, net | 1,181,028 | 1,204,581
Unsecured notes payable, net | 503,966 | 420,858
Total Indebtedness | 1,787,899 | 1,763,839
Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 1,114,038 | 1,143,152
Mortgages |  |
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | (4,671) | (6,507)
Unamortized premium | 471 | 548
Mortgage and other notes payable, net | 1,181,028 | 1,204,581
Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | (4,110) | (256)
Unsecured notes payable, net | $ 503,966 | 420,858
Core Portfolio | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.50% |
Core Portfolio | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.90% |
Core Portfolio | Unsecured Notes Payable | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.55% |
Core Portfolio | Mortgages |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 219,225 | 228,310
Core Portfolio | Mortgages | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 146,061 | $ 147,810
Core Portfolio | Mortgages | Fixed Rate | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.88% | 3.88%
Maturity Date | 2024-02 |
Core Portfolio | Mortgages | Fixed Rate | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 5.89% | 5.89%
Maturity Date | 2035-04 |
Core Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 73,164 | $ 80,500
Core Portfolio | Mortgages | Variable Rate - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.41% | 3.41%
Maturity Date | 2023-01 |
Core Portfolio | Mortgages | Variable Rate - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.54% | 4.54%
Maturity Date | 2028-11 |
Core Portfolio | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 400,000 | $ 380,000
Core Portfolio | Unsecured Debt | Variable Rate Credit Facility |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross |  | $ 30,000
Core Portfolio | Unsecured Debt | Variable Rate Credit Facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 2.55%
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2026-06 |
Long-term debt, gross | $ 400,000 | $ 350,000
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.65% | 2.49%
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 5.32% | 5.02%
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2025-06 |
Long-term debt, gross | $ 102,905 | $ 138,400
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.65% | 2.49%
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 5.32% | 5.02%
Variable Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 682,171 | $ 626,902
Fund II | Fund Portfolio |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 237,943 | 228,282
Fund II | Fund Portfolio | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.39% |
Fund II | Fund Portfolio | Mortgages |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 256,531 | $ 247,085
Fund II | Fund Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.88% | 2.88%
Maturity Date | 2021-11 |
Long-term debt, gross | $ 18,588 | $ 18,803
Fund II | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.00% | 3.00%
Maturity Date | 2022-03 |
Fund II | Fund Portfolio | Mortgages | Variable Rate Debt | Prime Rate |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.00% | 2.00%
Maturity Date | 2022-08 |
Fund II | Fund Portfolio | Unsecured Debt | Unsecured Notes Payable |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 40,000 | $ 40,000
Fund II | Fund Portfolio | Unsecured Debt | Unsecured Notes Payable | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.25% | 1.65%
Maturity Date | 2022-09 |
Fund III | Fund Portfolio | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.75% |
Fund III | Fund Portfolio | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.10% |
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 71,003 | $ 71,918
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.75% | 2.75%
Maturity Date | 2022-06 |
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.10% | 3.10%
Maturity Date | 2022-07 |
Fund IV | Fund Portfolio | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.75% |
Fund IV | Fund Portfolio | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.00% |
Fund IV | Fund Portfolio | Mortgages |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 278,630 | $ 327,550
Fund IV | Fund Portfolio | Mortgages | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.50% |
Maturity Date | 2025-10 |
Long-term debt, gross | $ 1,120 | $ 6,726
Fund IV | Fund Portfolio | Mortgages | Fixed Rate | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage |  | 3.40%
Fund IV | Fund Portfolio | Mortgages | Fixed Rate | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage |  | 4.50%
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 42,385 | $ 66,590
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.48% | 3.48%
Maturity Date | 2022-04 |
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 4.61% | 4.61%
Maturity Date | 2022-12 |
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 235,125 | $ 254,234
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.60% |
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.65% |
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 1.60%
Maturity Date | 2021-11 |
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 3.40%
Maturity Date | 2026-06 |
Fund IV | Fund Portfolio | Unsecured Debt | Term Loan Subscription Facility |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross |  | $ 864
Fund IV | Fund Portfolio | Unsecured Debt | Term Loan Subscription Facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.90% | 1.90%
Maturity Date | 2021-12 |
Fund V | Unsecured Debt | Subscription Line |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2022-05 |
Fund V | Fund Portfolio | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.50% |
Fund V | Fund Portfolio | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.20% |
Fund V | Fund Portfolio | Mortgages |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 359,839 | $ 335,677
Fund V | Fund Portfolio | Mortgages | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.35% |
Maturity Date | 2023-05 |
Long-term debt, gross | $ 31,801 |
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 298,014 | $ 334,323
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.43% | 2.95%
Maturity Date | 2022-02 |
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.78% | 4.78%
Maturity Date | 2024-12 |
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 30,024 |
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.85% |
Maturity Date | 2022-06 |
Long-term debt, gross |  | $ 1,354
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.50% |
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 2.20%
Fund V | Fund Portfolio | Unsecured Debt | Subscription Line |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 68,076 | $ 250
Fund V | Fund Portfolio | Unsecured Debt | Subscription Line | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.90% | 1.60%
Maturity Date | 2022-05 |

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