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Investment in Unconsolidated Entities - Combined Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Assets |  |  |  |  |  |  |  |  |  |  |  |
Net investment properties | $ 1,929,441 |  |  |  | $ 1,958,189 |  |  |  | $ 1,929,441 | $ 1,958,189 |  |
Other assets | 20,372 |  |  |  | 22,836 |  |  |  | 20,372 | 22,836 |  |
Total assets | 2,407,339 |  |  |  | 2,507,188 |  |  |  | 2,407,339 | 2,507,188 |  |
Liabilities and equity: |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities | 36,569 |  |  |  | 29,039 |  |  |  | 36,569 | 29,039 |  |
Equity | 1,738,863 |  |  |  | 1,819,601 |  |  |  | 1,738,863 | 1,819,601 | $ 1,852,314 | $ 1,905,722
Total liabilities and stockholders' equity | 2,407,339 |  |  |  | 2,507,188 |  |  |  | 2,407,339 | 2,507,188 |  |
Carrying value of investments in unconsolidated entities | 109,051 |  |  |  | 118,861 |  |  |  | 109,051 | 118,861 |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |
Total income | 51,211 | $ 52,545 | $ 41,639 | $ 52,438 | 54,740 | $ 58,169 | $ 57,190 | $ 56,391 | 197,833 | 226,490 | 242,674 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (87,755) | (97,429) | (100,593) |
Real estate taxes |  |  |  |  |  |  |  |  | (30,845) | (34,232) | (35,205) |
Interest expense, net |  |  |  |  |  |  |  |  | (18,749) | (22,717) | (24,943) |
(Loss) gain on extinguishment of debt, net |  |  |  |  |  |  |  |  | (2,543) | (2,901) | 9,103 |
Provision for asset impairment |  |  |  |  |  |  |  |  | (9,002) | (2,359) | (3,510) |
Net (loss) income |  |  |  |  |  |  |  |  | (10,174) | 38,399 | 83,849 |
Equity in (losses) earnings and (impairment), net, of unconsolidated entities |  |  |  |  |  |  |  |  | (3,141) | 957 | (31,393) |
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  | (4,017) | (3,206) | (3,432) |
Company's share of net loss |  |  |  |  |  |  |  |  | (2,264) | (3,446) | (1,870) |
Equity in (losses) earnings and (impairment), net, of unconsolidated entities |  |  |  |  |  |  |  |  | (3,141) | 957 | (31,393) |
IAGM Retail Fund I, LLC |  |  |  |  |  |  |  |  |  |  |  |
Liabilities and equity: |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of investments in unconsolidated entities |  |  |  |  | 118,861 |  |  |  |  | 118,861 |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of real estate, net |  |  |  |  |  |  |  |  | 1,741 |  |  |
Provision for asset impairment |  |  |  |  |  |  |  |  | (11,015) |  |  |
IAGM Retail Fund I, LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Net investment properties | 387,394 |  |  |  | 425,585 |  |  |  | 387,394 | 425,585 |  |
Other assets | 72,453 |  |  |  | 66,437 |  |  |  | 72,453 | 66,437 |  |
Total assets | 459,847 |  |  |  | 492,022 |  |  |  | 459,847 | 492,022 |  |
Liabilities and equity: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt, net | 242,388 |  |  |  | 256,732 |  |  |  | 242,388 | 256,732 |  |
Other liabilities | 19,144 |  |  |  | 20,765 |  |  |  | 19,144 | 20,765 |  |
Equity | 198,315 |  |  |  | 214,525 |  |  |  | 198,315 | 214,525 |  |
Total liabilities and stockholders' equity | 459,847 |  |  |  | 492,022 |  |  |  | 459,847 | 492,022 |  |
Company's share of equity | 109,928 |  |  |  | 118,861 |  |  |  | 109,928 | 118,861 |  |
Outside basis difference, net | (877) |  |  |  | 0 |  |  |  | (877) | 0 |  |
Carrying value of investments in unconsolidated entities | $ 109,051 |  |  |  | $ 118,861 |  |  |  | 109,051 | 118,861 |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |
Total income |  |  |  |  |  |  |  |  | 46,259 | 53,396 | 57,649 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (16,303) | (20,135) | (21,001) |
Property operating |  |  |  |  |  |  |  |  | (7,143) | (8,372) | (8,898) |
Real estate taxes |  |  |  |  |  |  |  |  | (8,687) | (9,426) | (9,891) |
Asset management fees |  |  |  |  |  |  |  |  | (1,098) | (1,073) | (1,080) |
Interest expense, net |  |  |  |  |  |  |  |  | (7,455) | (10,882) | (13,193) |
Other (expense) and income, net |  |  |  |  |  |  |  |  | (307) | 157 | 237 |
(Loss) gain on extinguishment of debt, net |  |  |  |  |  |  |  |  | (8) | 0 | (20) |
Gain (loss) on sale of real estate, net |  |  |  |  |  |  |  |  | 1,741 | (559) | (4,135) |
Provision for asset impairment |  |  |  |  |  |  |  |  | (11,016) | (1,443) | (3,673) |
Net (loss) income |  |  |  |  |  |  |  |  | (4,017) | 1,663 | (4,005) |
Outside basis adjustment for investee's sale of real estate, net |  |  |  |  |  |  |  |  | (877) | 4,403 | 0 |
Impairment of DRV |  |  |  |  |  |  |  |  | 0 | 0 | (29,933) |
Distributions in excess of the investments' carrying value |  |  |  |  |  |  |  |  | 0 | 0 | 410 |
Downtown Railyard Venture, LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  | $ 0 | $ (4,869) | $ 573 |

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