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Investment in Unconsolidated Entities - Narrative (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 24, 2019 USD ($) | Apr. 17, 2013 USD ($) | Dec. 31, 2020 USD ($) ft² derivative_instrument property | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) property | Jan. 01, 2018 USD ($) | Dec. 31, 2013 property
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  | $ 109,051,000 | $ 118,861,000 |  |  |
Proceeds from the sale and transfer of investment properties, net |  |  | 8,027,000 | 346,707,000 | $ 430,514,000 |  |
Provision for asset impairment |  |  | 9,002,000 | 2,359,000 | 3,510,000 |  |
IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Repayment of mortgage note payable on one retail property |  |  | 14,872,000 |  |  |  |
Retail |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Proceeds from the sale and transfer of investment properties, net |  |  |  |  | 2,274,000 |  |
Purchase price |  |  | 42,247,000 | $ 365,764,000 |  |  |
Equity method investment, Impairments |  |  | $ 6,059,000 |  |  |  |
Square Feet | ft² |  |  | 237,822 | 977,400 |  |  |
Provision for asset impairment |  |  |  |  | 2,020,000 |  |
Retail | IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Gain (loss) on sale of real estate, net |  |  |  |  | (4,135,000) |  |
Equity method investment, Impairments |  |  |  |  | $ 3,673,000 |  |
Number of retail properties | property |  |  | 1 |  | 3 |  |
Number of retail properties sold | property |  |  |  |  | 2 |  |
Rockwell Plaza | Retail |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Gain (loss) on sale of real estate, net |  |  |  | $ (307,000) |  |  |
Equity method investment, Impairments |  |  |  | 794,000 |  |  |
Rockwell Plaza | Retail | IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Proceeds from the sale and transfer of investment properties, net |  |  |  | 20,500,000 |  |  |
Gain (loss) on sale of real estate, net |  |  |  | (559,000) |  |  |
Equity method investment, Impairments |  |  |  | $ 1,443,000 |  |  |
Square Feet | ft² |  |  |  | 255,000 |  |  |
IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  | 55.00% | 55.00% |  |  |
Investment in unconsolidated entities |  |  |  | $ 118,861,000 |  |  |
Amortization period |  |  | 30 years |  |  |  |
Aggregate deferred gain |  |  | $ 958,000 |  |  |  |
Gain (loss) on sale of real estate, net |  |  | 1,741,000 |  |  |  |
IAGM Retail Fund I, LLC | Retail |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Equity method investment, Impairments |  |  | 11,015,000 |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Derivative liability |  |  | $ 289,000 |  |  |  |
Interest Rate Swap | IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of derivatives held | derivative_instrument |  |  | 2 |  |  |  |
Derivative liability |  |  | $ 525,000 |  |  |  |
Interest Rate Swap, Effective Date April 1, 2020, 1.979% Fixed Interest | IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Notional amount |  |  | $ 45,000 |  |  |  |
Fixed interest rate |  |  | 1.979% |  |  |  |
Interest Rate Swap, Effective Date April 1, 2020, 1.956% Fixed Interest | IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Notional amount |  |  | $ 30,000 |  |  |  |
Fixed interest rate |  |  | 1.956% |  |  |  |
Unconsolidated Entities | Downtown Railyard Venture, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Investment in unconsolidated entities, impairment loss |  |  |  | 29,933,000 |  |  |
Proceeds from divestiture | $ 30,000,000 |  |  |  |  |  |
Realized gain (loss) on disposal |  |  |  | 0 |  |  |
Unconsolidated Entities | IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of retail properties contributed | property |  |  |  |  |  |  | 14
Proceeds from the sale and transfer of investment properties, net |  | $ 15,625,000 |  |  |  |  |
Amortization period |  | 30 years |  |  |  |  |
Aggregate deferred gain |  |  |  |  |  | $ 12,756,000 |
Antoine Town Center |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Aggregate deferred gain |  |  | $ 54,000 |  |  |  |
Antoine Town Center | Retail |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Purchase price |  |  | $ 22,254,000 |  |  |  |
Square Feet | ft² |  |  | 110,500 |  |  |  |
Mortgages |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Debt extinguished |  |  |  | $ 16,250,000 |  |  |

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