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Investments in and Advances to Unconsolidated Real Estate Ventures - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) ft² | Sep. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) ft² | Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  |  | $ (1,395) | $ 39,409 | $ (4,143)
Proceeds from sale of real estate |  |  |  | 377,511 | 413,077 | 0
Gain on sale of real estate |  |  |  | 104,991 | 52,183 | 0
Investments in Joint Ventures |  |  |  | 181,813 | 95,923 | 0
Payments to Acquire Interest in Joint Venture |  |  |  |  | 10,100 |
Investments in Unconsolidated Real Estate Ventures [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Property Management Fee Revenue |  |  |  | $ 28,500 | 26,100 | $ 12,900
Prudential Global Investment Management (PGIM) [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage Sold | 50.00% |  |  | 50.00% |  |
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures, Excluding Advances | $ 215,624 | $ 0 |  | $ 215,624 | 0 |
Area of real estate property (in square feet) | ft² | 552,000 |  |  | 552,000 |  |
Proceeds from sale of real estate | $ 220,000 |  |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  | 50.00% |  |
Central Place Tower [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Gain on sale of real estate |  |  |  | $ 53,400 |  |
1101 17th Street [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures, Excluding Advances | $ 0 | $ 0 |  | 0 | 0 |
Income (Loss) from Equity Method Investments |  |  |  | 6,400 | $ 8,300 |
The Warner [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Area of real estate property (in square feet) | ft² |  | 583,000 |  |  | 583,000 |
Proceeds from sale of real estate |  |  |  |  | $ 376,500 |
Gain on sale of real estate |  |  |  |  | 32,500 |
Equity Method Investment, Realized Gain (Loss) on Disposal |  | $ 20,600 |  |  | 20,600 |
Repayments of Secured Debt |  |  |  |  | 270,500 |
1900 N Street [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments in Joint Ventures |  |  |  |  | 95,900 |
Long-term Purchase Commitment, Amount |  |  |  |  | $ 101,300 |
Equity Method Investment, Ownership Percentage |  | 45.00% |  |  | 45.00% |
CIM/PacLife [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures, Excluding Advances | $ 10,385 | $ 9,339 |  | $ 10,385 | $ 9,339 |
Equity Method Investment, Ownership Percentage | 16.70% | 16.67% |  | 16.70% | 16.67% |
Investment Building [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage Sold |  | 5.00% |  |  | 5.00% |
Area of real estate property (in square feet) | ft² |  | 401,000 |  |  | 401,000 |
Proceeds from sale of real estate |  |  |  |  | $ 24,600 |
Equity Method Investment, Realized Gain (Loss) on Disposal |  |  | $ 15,500 |  | 15,500 |
Investments in Unconsolidated Real Estate Ventures [Member] | 1101 17th Street [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  |  |  | $ 5,400 |
JBG Companies [Member] | 1900 N Street [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 100.00% |  |  | 100.00% |
Equity Method Investment, Ownership Percentage After Funding Of Contributions | 55.00% |  |  | 55.00% |  |
Legacy JBG Funds [Member] | CIM/PacLife [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 47.64% |  |  | 47.64% |

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