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Debt - Summary of Consolidated Indebtedness (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,796,275 | $ 1,717,928
Net unamortized debt issuance costs | (7,261) | (10,383)
Unamortized fair market value of assumed debt | 574 | 651
Mortgage and other notes payable, net | 1,159,688 | 1,170,076
Unsecured notes payable, net | 502,500 | 477,320
Total Indebtedness | 1,789,588 | 1,708,196
Mortgages |  |
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | (6,932) | (10,078)
Unamortized fair market value of assumed debt | 574 | 651
Mortgage and other notes payable, net | 1,159,688 | $ 1,170,076
Mortgages | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 1.70%
Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | (329) | $ (305)
Unsecured notes payable, net | $ 502,500 | 477,320
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 | 1.25% |
Core Portfolio | Mortgages |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 255,398 | 257,735
Core Portfolio | Mortgages | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 174,628 | $ 176,176
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 | 6.00% | 6.00%
Maturity Date | 2035-04 |
Core Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 80,770 | $ 81,559
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 | $ 380,000 | $ 350,000
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 30,000 |
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans | LIBOR |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.55% |
Maturity Date | 2021-06 |
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2023-03 |
Long-term debt, gross | $ 350,000 | $ 350,000
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.49% | 2.49%
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 5.02% | 5.02%
Core Portfolio | Unsecured Debt | Unsecured Line of Credit - Swapped |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2022-03 |
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 127,400 | $ 60,800
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.49% | 2.49%
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 5.02% | 5.02%
Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,361,199 | $ 1,403,324
Variable Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 435,076 | 314,604
Fund II | Fund Portfolio |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 26,670 | 24,225
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 | $ 245,542 | $ 243,298
Fund II | Fund Portfolio | Mortgages | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.75% | 4.75%
Maturity Date | 2022-05 |
Long-term debt, gross | $ 200,000 | $ 200,000
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 | $ 18,872 | $ 19,073
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 | Unsecured Debt | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.65% | 1.65%
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] |  |
Maturity Date | 2021-09 |
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 | $ 75,722 | $ 74,554
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 | 2021-01 |
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 | 2021-06 |
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 | 2.25% |
Fund IV | Fund Portfolio | Mortgages |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 253,490 | $ 267,903
Fund IV | Fund Portfolio | Mortgages | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 8,189 | $ 8,189
Fund IV | Fund Portfolio | Mortgages | Fixed Rate | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.40% | 3.40%
Maturity Date | 2025-10 |
Fund IV | Fund Portfolio | Mortgages | Fixed Rate | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.50% | 4.50%
Maturity Date | 2026-06 |
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 66,921 | $ 102,699
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.48% | 3.48%
Maturity Date | 2021-03 |
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 | $ 178,380 | $ 157,015
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.60% | 1.60%
Maturity Date | 2020-09 |
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.40% | 3.40%
Maturity Date | 2021-08 |
Fund IV | Fund Portfolio | Unsecured Debt | Term Loan Subscription Facility |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 82,829 | $ 87,625
Fund IV | Fund Portfolio | Unsecured Debt | Term Loan Subscription Facility | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.65% | 1.65%
Maturity Date | 2020-12 |
Fund IV | Fund Portfolio | Unsecured Debt | Term Loan Subscription Facility | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.00% | 2.00%
Maturity Date | 2021-06 |
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 | $ 335,894 | $ 336,013
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 334,416 | $ 334,626
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.95% | 2.95%
Maturity Date | 2021-02 |
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 4.78% | 4.78%
Maturity Date | 2024-12 |
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,478 | $ 1,387
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.50% | 1.50%
Maturity Date | 2021-02 |
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.20% | 2.20%
Maturity Date | 2024-12 |
Fund V | Fund Portfolio | Unsecured Debt | Subscription Line |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 0 | $ 0
Fund V | Fund Portfolio | Unsecured Debt | Subscription Line | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.60% |
Maturity Date | 2021-05 |

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