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Debt - Summary of Consolidated Indebtedness (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 1,819,738 | $ 1,713,274
Net unamortized debt issuance costs |  | (7,946) | (5,978)
Unamortized Premium |  | 446 | 548
Secured Debt, Total |  | 1,140,293 | 1,148,586
Unsecured notes payable, net |  | 559,040 | 420,858
Total Indebtedness |  | $ 1,812,238 | 1,707,844
SOFR | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.01% |
Fund Portfolio | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 255,978 | 228,282
Fund Portfolio | LIBOR | Fund V | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.20% |
Fund Portfolio | LIBOR | Fund V | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.50% |
Variable Rate |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [1] | $ 780,935 | 589,019
Mortgages |  |  |
Debt Instrument [Line Items] |  |  |
Net unamortized debt issuance costs |  | (3,958) | (5,722)
Unamortized Premium |  | 446 | 548
Secured Debt, Total |  | 1,140,293 | 1,148,586
Mortgages | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 218,421 | 228,310
Mortgages | Fund Portfolio | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 255,978 | 247,085
Mortgages | Fund Portfolio | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 246,268 | 306,740
Mortgages | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 388,410 | 335,677
Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Net unamortized debt issuance costs |  | (3,988) | (256)
Unsecured notes payable, net |  | 559,040 | 420,858
Unsecured Debt | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 400,000 | 380,000
Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured notes payable, net |  | 112,905 | 138,400
Fixed Rate |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [2],[3] | 1,038,803 | 1,124,255
Fixed Rate | Mortgages | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 145,464 | $ 147,810
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% |
Maturity Date |  | 2025-10 |
Long-term debt, gross |  | $ 1,120 | $ 6,726
Fixed Rate | Mortgages | Fund Portfolio | Fund IV | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  |  | 4.50%
Fixed Rate | Mortgages | Fund Portfolio | Fund IV | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  |  | 3.40%
Fixed Rate | Mortgages | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 3.35% |
Maturity Date |  | 2023-05 |
Long-term debt, gross |  | $ 31,801 |
Variable Rate Debt | Core Portfolio | LIBOR | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.90% |
Variable Rate Debt | Core Portfolio | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.50% |
Variable Rate Debt | Fund Portfolio | LIBOR | Fund III | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.75% |
Variable Rate Debt | Mortgages | Fund Portfolio | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Maturity Date |  | 2022-08 |
Variable Rate Debt | Mortgages | Fund Portfolio | Fund III |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 34,728 | 35,948
Variable Rate Debt | Mortgages | Fund Portfolio | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 221,832 | $ 252,324
Variable Rate Debt | Mortgages | Fund Portfolio | Fund IV | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 3.65% | 3.40%
Maturity Date |  | 2026-06 |
Variable Rate Debt | Mortgages | Fund Portfolio | Fund IV | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.60% | 1.60%
Maturity Date |  | 2022-02 |
Variable Rate Debt | Mortgages | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 58,878 | $ 1,354
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% | 3.00%
Maturity Date |  | 2022-03 |
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund III | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.75% | 2.75%
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund III | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.75% | 2.75%
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 |  |  | 2.20%
Maturity Date |  | 2026-11 |
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund V | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  |  | 1.50%
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] | $ 72,957 | $ 80,500
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] | 2023-01 |
Variable Rate - Swapped | Mortgages | Fund Portfolio | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  |  | 2.88%
Long-term debt, gross |  | $ 0 | $ 18,803
Variable Rate - Swapped | Mortgages | Fund Portfolio | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [4] | $ 23,316 | $ 47,690
Variable Rate - Swapped | Mortgages | Fund Portfolio | Fund IV | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | [4] | 4.61% | 4.61%
Maturity Date | [4] | 2022-12 |
Variable Rate - Swapped | Mortgages | Fund Portfolio | Fund IV | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | [4] | 3.48% | 3.48%
Maturity Date | [4] | 2022-04 |
Variable Rate - Swapped | Mortgages | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [4] | $ 297,731 | $ 334,323
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] | 2022-02 |
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 | $ 350,000
Variable Rate Unsecured Term Loans - Swapped | Unsecured Debt | Core Portfolio | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 5.32% | 5.02%
Variable Rate Unsecured Term Loans - Swapped | Unsecured Debt | Core Portfolio | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 3.65% | 2.49%
Variable Rate Unsecured Term Loans - Swapped | Line of Credit | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Maturity Date |  | 2025-06 |
Long-term debt, gross |  | $ 46,491 | $ 0
Variable Rate Unsecured Term Loans - Swapped | Line of Credit | Core Portfolio | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 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% | 1.65%
Maturity Date |  | 2022-09 |
Term Loan Subscription Facility | Unsecured Debt | Fund Portfolio | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  |  | $ 864
Term Loan Subscription Facility | Unsecured Debt | Fund Portfolio | LIBOR | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 2.01% | 1.90%
Maturity Date |  | 2022-12 |
Subscription Line | Unsecured Debt | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Maturity Date |  | 2022-05 |
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 118,028 | $ 250
Subscription Line | Unsecured Debt | Fund Portfolio | LIBOR | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.90% | 1.60%
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] | $ 66,414 | $ 138,400
Unsecured Line of Credit - Swapped | Line of Credit | Core Portfolio | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 5.32% | 5.02%
Unsecured Line of Credit - Swapped | Line of Credit | Core Portfolio | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | [4] | 3.65% | 2.49%
Variable Rate Credit Facility [Member] | Unsecured Debt | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  |  | $ 30,000
Variable Rate Credit Facility [Member] | Unsecured Debt | Core Portfolio | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  |  | 2.55%
[1] | Includes $110.5 million and $103.2 million, respectively, of variable-rate debt that is subject to interest cap agreements.
[2] | Fixed-rate debt at December 31, 2021 and 2020 includes $0.0 million and $3.2 million, respectively of Core swaps that may be used to hedge debt instruments of the Funds.
[3] | Includes $860.4 million and $969.7 million, respectively, of variable-rate debt that has been fixed with interest rate swap agreements as of the periods presented.
[4] | At December 31, 2021, the stated rates ranged from LIBOR + 1.50% to LIBOR +1.90% for Core variable-rate debt; LIBOR + 2.75% for Fund III variable-rate debt; LIBOR +2.00% 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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