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Debt - Summary of Consolidated Indebtedness (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 1,826,271 | $ 1,819,738
Net unamortized debt issuance costs |  | (7,045) | (7,946)
Unamortized premium |  | 420 | 446
Mortgage and other notes payable, net |  | 1,095,445 | 1,140,293
Unsecured notes payable, net |  | 529,796 | 559,040
Total Indebtedness |  | 1,819,646 | 1,812,238
Fund Portfolio | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 256,212 | 255,978
Fund Portfolio | Fund III |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 35,970 | 34,728
Variable Rate |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [1] | 850,330 | 780,935
Mortgages |  |  |
Debt Instrument [Line Items] |  |  |
Net unamortized debt issuance costs |  | (3,315) | (3,958)
Unamortized premium |  | 420 | 446
Mortgage and other notes payable, net |  | 1,095,445 | 1,140,293
Mortgages | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 205,397 | 218,421
Mortgages | Fund Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 386,653 | 388,410
Mortgages | Fund Portfolio | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 214,108 | 246,268
Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Net unamortized debt issuance costs |  | (3,730) | (3,988)
Unsecured notes payable, net |  | 529,796 | 559,040
Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured notes payable, net |  | 194,405 | 112,905
Fixed Rate |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [2],[3] | 975,941 | 1,038,803
Fixed Rate | Mortgages | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 144,867 | $ 145,464
Fixed Rate | Mortgages | Core Portfolio | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 5.89% | 5.89%
Maturity Date |  | 2035-04 |
Fixed Rate | Mortgages | Core Portfolio | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 3.88% | 3.88%
Maturity Date |  | 2024-02 |
Fixed Rate | Mortgages | Fund Portfolio | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 4.50% | 4.50%
Maturity Date |  | 2025-10 |
Long-term debt, gross |  | $ 1,120 | $ 1,120
Fixed Rate | Mortgages | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 3.35% | 3.35%
Maturity Date |  | 2023-05 |
Long-term debt, gross |  | $ 31,801 | $ 31,801
Variable Rate Debt | Core Portfolio | LIBOR | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.70% |
Variable Rate Debt | Core Portfolio | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.50% |
Variable Rate Debt | Fund Portfolio | Prime rate | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.00% |
Variable Rate Debt | Fund Portfolio | LIBOR | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.75% |
Variable Rate Debt | Fund Portfolio | LIBOR | Fund III |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 3.10% |
Variable Rate Debt | Fund Portfolio | LIBOR | Fund IV | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 3.65% |
Variable Rate Debt | Fund Portfolio | LIBOR | Fund IV | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.75% |
Variable Rate Debt | Fund Portfolio | LIBOR | Fund V | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.20% |
Variable Rate Debt | Fund Portfolio | LIBOR | Fund V | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.50% |
Variable Rate Debt | Mortgages | Fund Portfolio | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Maturity Date |  | 2023-03 |
Variable Rate Debt | Mortgages | Fund Portfolio | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 212,988 | 221,832
Variable Rate Debt | Mortgages | Fund Portfolio | Fund IV | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 3.65% |
Variable Rate Debt | Mortgages | Fund Portfolio | Fund IV | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.75% |
Variable Rate Debt | Mortgages | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 58,583 | $ 58,878
Variable Rate Debt | Mortgages | Fund Portfolio | Prime rate | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.00% | 2.00%
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.75% | 2.75%
Maturity Date |  | 2022-08 |
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund III | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 3.10% | 2.75%
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund III | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Maturity Date |  | 2022-07 |
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund IV | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  |  | 3.65%
Maturity Date |  | 2026-06 |
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund IV | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  |  | 1.60%
Maturity Date |  | 2022-06 |
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.85% |
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund V | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.76% |
Maturity Date |  | 2026-11 |
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund V | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  |  | 1.85%
Maturity Date |  | 2022-06 |
Variable Rate Debt | Mortgages | Fund Portfolio | SOFR | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.76% |
Variable Rate - Swapped | Mortgages | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [4] | $ 60,530 | $ 72,957
Variable Rate - Swapped | Mortgages | Core Portfolio | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 4.54% | 4.54%
Maturity Date | [4] | 2028-11 |
Variable Rate - Swapped | Mortgages | Core Portfolio | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 3.41% | 3.41%
Maturity Date | [4] | 2026-06 |
Variable Rate - Swapped | Mortgages | Fund Portfolio | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  |  | $ 23,316
Variable Rate - Swapped | Mortgages | Fund Portfolio | Fund IV | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  |  | 4.61%
Variable Rate - Swapped | Mortgages | Fund Portfolio | Fund IV | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  |  | 3.48%
Variable Rate - Swapped | Mortgages | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [4] | $ 296,269 | $ 297,731
Variable Rate - Swapped | Mortgages | Fund Portfolio | Fund V | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 4.78% | 4.78%
Maturity Date | [4] | 2024-12 |
Variable Rate - Swapped | Mortgages | Fund Portfolio | Fund V | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 2.43% | 2.95%
Maturity Date | [4] | 2022-06 |
Variable Rate Unsecured Term Loans - Swapped | Unsecured Debt | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Maturity Date | [4] | 2026-06 |
Long-term debt, gross | [4] | $ 400,000 | $ 400,000
Variable Rate Unsecured Term Loans - Swapped | Unsecured Debt | Core Portfolio | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 5.32% | 5.32%
Variable Rate Unsecured Term Loans - Swapped | Unsecured Debt | Core Portfolio | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 3.65% | 3.65%
Variable Rate Unsecured Term Loans - Swapped | Line of Credit | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Maturity Date |  | 2025-06 |
Long-term debt, gross |  | $ 153,051 | $ 46,491
Variable Rate Unsecured Term Loans - Swapped | Line of Credit | Core Portfolio | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.40% | 1.40%
Unsecured Notes Payable | Core Portfolio | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.55% |
Unsecured Notes Payable | Unsecured Debt | Fund Portfolio | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 40,000 | $ 40,000
Unsecured Notes Payable | Unsecured Debt | Fund Portfolio | LIBOR | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.25% | 2.25%
Maturity Date |  | 2022-09 |
Term Loan Subscription Facility | Unsecured Debt | Fund Portfolio | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 0 | $ 5,000
Term Loan Subscription Facility | Unsecured Debt | Fund Portfolio | SOFR | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.01% | 2.01%
Maturity Date |  | 2022-12 |
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 93,526 | $ 118,028
Subscription Line | Unsecured Debt | Fund Portfolio | LIBOR | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.90% | 1.90%
Maturity Date |  | 2022-05 |
Unsecured Line of Credit - Swapped | Line of Credit | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Maturity Date | [4] | 2025-06 |
Long-term debt, gross | [4] | $ 41,354 | $ 66,414
Unsecured Line of Credit - Swapped | Line of Credit | Core Portfolio | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 5.32% | 5.32%
Unsecured Line of Credit - Swapped | Line of Credit | Core Portfolio | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 3.65% | 3.65%
[1] | Includes $107.3 million and $110.5 million, respectively, of variable-rate debt that is subject to interest cap agreements.
[2] | Fixed-rate debt at March 31, 2022 and December 31, 2021 includes $0.0 million and $0.0 million, respectively of Core swaps that may be used to hedge debt instruments of the Funds.
[3] | Includes $798.2 million and $860.4 million, respectively, of variable-rate debt that has been fixed with interest rate swap agreements as of the periods presented.
[4] | At March 31, 2022, the stated rates ranged from LIBOR + 1.50% to LIBOR +1.70% for Core variable-rate debt; LIBOR + 2.75% to PRIME + 2.00% for Fund II variable-rate debt; LIBOR + 3.10% for Fund III variable-rate debt; LIBOR 1.75% to LIBOR + 3.65% for Fund IV variable-rate debt; LIBOR + 1.50% to LIBOR + 2.20% for Fund V variable-rate debt; LIBOR + 1.55% for Core variable-rate unsecured term loans; and LIBOR + 1.40% for Core variable-rate unsecured lines of credit.

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