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Land and Development - Acquisitions, Dispositions, and Impairments (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) a property | Dec. 31, 2018 USD ($) | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Revenues |  | $ 145,338 | $ 122,141 | $ 350,608 | $ 657,956 |  |
Number of land parcels sold | property |  |  |  |  | 2 |  |
Area of land parcels sold (acres) | a |  |  |  |  | 93 |  |
Loan receivable |  | 660,522 |  | 660,522 |  | $ 870,992 |
Impairment of land and development assets |  |  |  | 1,100 | $ 1,300 |  |
Financing provided to buyers |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Financing provided to buyers of land parcels |  |  |  |  | 145,000 |  |
Loan receivable |  | 85,100 |  | 85,100 |  |  |
Land development |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Revenues |  | 54,918 | 12,309 | 76,691 | 369,665 |  |
Cost of sales expense |  | $ 48,101 | $ 12,114 | $ 71,785 | 318,881 |  |
Land |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Acquisitions of land and development assets through foreclosure |  |  |  |  | $ 4,600 |  |
Unconsolidated entity |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Real estate transaction price | $ 34,300 |  |  |  |  |  |
Payments to acquire land and develop asset | 7,300 |  |  |  |  |  |
Assumption of loan in acquisition transaction | $ 27,000 |  |  |  |  |  |
Other Real Estate Equity Investment Dec 2016 |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Equity interest (percent) |  | 50.00% |  | 50.00% |  |  | 50.00%

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