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Investments in Non-Consolidated Entities - Schedule of Investments in and Non-consolidated Entities (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) a term property | Dec. 31, 2019 USD ($) a office_asset partnership | Dec. 31, 2018 USD ($) a building term | Dec. 31, 2017 USD ($) a
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 66,183 | $ 57,168 | $ 66,183 |
Proceeds from sale of property |  | 504,118 | 898,514 | $ 223,853
Real estate, at cost | 3,090,134 | $ 3,320,574 | 3,090,134 |
Mortgages | NNN Office Joint Venture |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Non-recourse debt | $ 362,800 |  | $ 362,800 |
Long-term debt, term | 3 years |  | 3 years |
Number of additional extensions available | term | 2 |  | 2 |
Term of additional extensions |  |  | 1 year |
Term of contract |  |  | 2 years |
Mortgages | NNN Office Joint Venture | London Interbank Offered Rate (LIBOR) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Basis spread on variable rate |  |  | 200.00% |
Basis spread rate increase per extension |  |  | 15.00% |
Cap interest rate | 4.00% |  | 4.00% |
Office Building |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of properties sold | property | 6 |  |  |
NNN Office Joint Venture Properties | Office Building | Transferred Property |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of properties sold | building |  |  | 21 |
Proceeds from sale of property |  |  | $ 725,800 |
Minimum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage |  | 15.00% |  |
Maximum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage |  | 25.00% |  |
NNN Office Joint Venture |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 20.00% | 20.00% | 20.00% |
Etna Park 70 |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage |  | 90.00% |  |
Etna Park 70 East LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage |  | 90.00% |  |
Etna Park 70 |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 4,774 | $ 8,352 | $ 4,774 |
Etna Park 70 East LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | 0 | 4,310 | 0 |
Other Joint Ventures |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 8,265 | $ 5,218 | $ 8,265 |
Number of joint venture interests | partnership |  | 1 |  |
Etna GL 66 LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Area of land (in acres) | a | 57 | 129.6 | 57 | 151
Real estate, at cost | $ 3,008 |  | $ 3,008 |
NNN Office Joint Venture |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 53,144 | $ 39,288 | 53,144 |
NNN Office Joint Venture | NNN Office Joint Venture Properties |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of properties sold | office_asset |  | 4 |  |
NNN Office Joint Venture | 2 of 21 Transferred Properties |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Contribution of property |  |  | 45,653 |
Payments to acquire interest in joint venture |  |  | 8,053 |
Gain (loss) on disposition of assets |  |  | 14,645 |
Transfer mortgage payable |  |  | $ 103,400 |

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