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Debt - Summary of Consolidated Indebtedness (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,717,928 | $ 1,560,333
Net unamortized debt issuance costs | (10,383) | (10,541)
Unamortized fair market value of assumed debt | 651 | 753
Mortgage and other notes payable, net | 1,170,076 | 1,017,288
Unsecured notes payable, net | 477,320 | 533,257
Total Indebtedness | 1,708,196 | 1,550,545
Mortgages |  |
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | (10,078) | (10,173)
Unamortized fair market value of assumed debt | 651 | 753
Mortgage and other notes payable, net | $ 1,170,076 | 1,017,288
Mortgages | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.70% |
Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | $ (305) | (368)
Unsecured notes payable, net | $ 477,320 | 533,257
Core Portfolio | Minimum |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2020-04 |
Core Portfolio | Maximum |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2026-04 |
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 | $ 257,735 | $ 260,854
Core Portfolio | Mortgages | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 1.65%
Core Portfolio | Mortgages | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 176,176 | $ 178,271
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 | $ 81,559 | $ 82,583
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% | 5.67%
Maturity Date | 2028-11 |
Core Portfolio | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 350,000 | $ 350,000
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2023-03 |
Long-term debt, gross | $ 350,000 | $ 349,617
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.49% | 2.54%
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 5.02% | 3.59%
Core Portfolio | Unsecured Debt | Term Loans |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross |  | $ 383
Core Portfolio | Unsecured Debt | Term Loans | LIBOR |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage |  | 1.25%
Maturity Date | 2023-03 |
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2022-03 |
Long-term debt, gross | $ 60,800 |
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.49% |
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 5.02% |
Fixed Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,403,324 | $ 1,001,658
Variable Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 314,604 | 558,675
Fund II | Fund Portfolio |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2020-12 |
Long-term debt, gross | $ 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] |  |
Maturity Date | 2022-03 |
Long-term debt, gross | $ 243,298 | 224,587
Fund II | Fund Portfolio | Mortgages | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.75% |
Maturity Date | 2020-05 |
Long-term debt, gross | $ 200,000 | $ 205,262
Fund II | Fund Portfolio | Mortgages | Fixed Rate | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage |  | 1.00%
Fund II | Fund Portfolio | Mortgages | Fixed Rate | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage |  | 4.75%
Fund II | Fund Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.88% | 4.27%
Maturity Date | 2021-11 |
Long-term debt, gross | $ 19,073 | $ 19,325
Fund II | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.00% |
Fund II | Fund Portfolio | Unsecured Debt | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.65% | 1.40%
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 | 2020-09 |
Fund III | Fund Portfolio |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2020-07 |
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 | $ 74,554 | $ 90,096
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.75% |
Maturity Date | 2020-06 |
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.10% | 4.65%
Maturity Date | 2021-01 |
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt | Prime Rate | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 0.50%
Fund IV | Fund Portfolio |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2021-02 |
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 | $ 267,903 | $ 313,095
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 | $ 102,699 | $ 71,841
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2020-03 |
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2022-12 |
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.48% | 3.67%
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 4.61% | 4.23%
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 157,015 | $ 233,065
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 | 2020-02 |
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.40% | 3.95%
Maturity Date | 2021-08 |
Fund IV | Fund Portfolio | Unsecured Debt | Term Loan / Subscription Facility |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 87,625 | $ 40,825
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% | 2.75%
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 | $ 336,013 | $ 138,076
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 334,626 | $ 86,570
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | Minimum |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2021-02 |
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | Maximum |  |
Debt Instrument [Line Items] |  |
Maturity Date | 2024-12 |
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.95% | 4.61%
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 4.78% | 4.78%
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,387 | $ 51,506
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 2.25%
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 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% |
Maturity Date | 2024-12 |
Fund V | Fund Portfolio | Unsecured Debt | Subscription Line |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross |  | $ 102,800
Fund V | Fund Portfolio | Unsecured Debt | Subscription Line | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 1.60%
Maturity Date | 2020-05 |

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