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Investment in Consolidated and Unconsolidated Entities - Narrative (Details) ft² in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 24, 2019 USD ($) | Apr. 17, 2013 USD ($) | Sep. 30, 2019 USD ($) ft² VIE | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) ft² VIE | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 | Jan. 01, 2018 USD ($) | Dec. 31, 2013 property
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of variable interest entities | VIE |  |  |  | 0 |  | 0 |  |  |  |  |
Proceeds from sale and transfer of investment properties, net |  |  |  |  |  | $ 183,588,000 | $ 254,424,000 |  |  |  |
Provision for asset impairment |  |  |  | $ 0 | $ 1,405,000 | 1,443,000 | 3,673,000 |  |  |  |
Proceeds from liquidation of unconsolidated entity |  |  |  |  |  | 30,000,000 | 0 |  |  |  |
Retail | Rockwell Plaza |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for asset impairment |  |  |  |  |  | 794,000 |  |  |  |  |
Loss on sale |  |  |  |  |  | 307,000 |  |  |  |  |
Retail | Bryant Square |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for asset impairment |  |  |  |  | 773,000 |  | 2,020,000 |  |  |  |
Loss on sale |  |  |  |  |  |  | 2,148,000 |  |  |  |
IAGM Retail Fund I, LLC | Retail |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for asset impairment |  |  |  |  | $ 1,405,000 |  | 3,673,000 |  |  |  |
IAGM Retail Fund I, LLC | Retail | Rockwell Plaza |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale and transfer of investment properties, net |  |  |  |  |  | $ 20,500,000 |  |  |  |  |
Area of real estate | ft² |  |  |  | 255 |  | 255 |  |  |  |  |
Provision for asset impairment |  |  |  |  |  | $ 1,443,000 |  |  |  |  |
Loss on sale |  |  |  |  |  | 559,000 |  |  |  |  |
IAGM Retail Fund I, LLC | Retail | Bryant Square |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on sale |  |  |  |  |  |  | $ 3,905,000 |  |  |  |
Unconsolidated Entities | IAGM Retail Fund I, LLC |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of retail properties contributed | property |  |  |  |  |  |  |  |  |  |  | 14
Proceeds from sale and transfer of investment properties, net |  |  | $ 15,625,000 |  |  |  |  |  |  |  |
Equity investment basis adjustment, amortization period |  |  |  |  |  |  |  |  | 30 years |  |
Deferred gain on sale of property |  |  |  |  |  |  |  |  |  | $ 12,756,000 |
Unconsolidated Entities | Downtown Railyard Venture, LLC |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from liquidation of unconsolidated entity |  | $ 30,000,000 |  |  |  |  |  |  |  |  |
Other-than-temporary-impairment on unconsolidated entity |  |  |  |  |  |  |  | $ 29,933,000 |  |  |
Gain (loss) on transaction |  |  |  |  |  |  |  | $ 0 |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extinguishment mortgage payable |  |  |  |  |  | $ 16,250,000 |  |  |  |  |
Extended Maturity | IAGM Retail Fund I, LLC |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extension period | 1 year |  |  |  |  |  |  |  |  |  |
Non Recourse, Mortgage Loan | IAGM Retail Fund I, LLC |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value of loans payable | $ 14,872,000 |  |  |  |  |  |  |  |  |  |
Loans Payable | Non Recourse, Mortgage Loan | IAGM Retail Fund I, LLC |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 15,103,000 |  |  |  |  |  |  |  |  |  |

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