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Investments in Non-Consolidated Entities - Schedule of Investment in Non-Consolidated Entities (Details) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2019 USD ($) | Dec. 31, 2018 USD ($) a term | Sep. 30, 2019 USD ($) office_asset | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) a building term | Dec. 31, 2017 a
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Investment balance |  | $ 66,183 | $ 53,796 |  | $ 66,183 |
Unconsolidated Properties |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Aggregate gross disposition price | $ 2,317 |  |  |  |  |
Gain (loss) on disposition of assets | $ 824 |  |  |  |  |
NNN Office Joint Venture |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Non-recourse debt |  |  | 374,680 |  |  |
NNN Office Joint Venture | Mortgages |  |  |  |  |  |
Investments in and Advances to Affiliates [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 |
NNN Office Joint Venture | Mortgages | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 2.00% |
Basis spread rate increase per extension |  |  |  |  | 0.15% |
Cap interest rate |  | 4.00% |  |  | 4.00% |
NNN Office Joint Venture Properties |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Aggregate gain on sale of properties |  |  | 3,529 |  |  |
Equity method investment, assets |  |  | 603,100 |  |  |
Equity method investment, liabilities |  |  | 394,142 |  |  |
Office Building | Transferred Property |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Aggregate gross disposition price |  |  | $ 448,900 | $ 967,799 |  |
Office Building | NNN Office Joint Venture Properties | Transferred Property |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Number of properties sold | building |  |  |  |  | 21 |
Aggregate gross disposition price |  |  |  |  | $ 725,800 |
NNN Office Joint Venture |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  | 20.00% | 20.00% |  | 20.00% |
Investment balance |  | $ 53,144 | $ 41,780 |  | $ 53,144 |
Proceeds from repayment of debt |  |  | 45,208 |  |  |
NNN Office Joint Venture | Mortgages |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Non-recourse mortgage loan |  |  | $ 101,520 |  |  |
NNN Office Joint Venture | NNN Office Joint Venture Properties |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Number of properties sold | office_asset |  |  | 4 |  |  |
Aggregate gross disposition price |  |  | $ 148,450 |  |  |
Aggregate gain on sale of properties |  |  | $ 17,644 |  |  |
NNN Office Joint Venture | 2 of 21 Transferred Properties |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Fair value of contributed property |  |  |  |  | 45,653 |
Payments to acquire interest in joint venture |  |  |  |  | 8,053 |
Gain (loss) on disposition of assets |  |  |  |  | 14,645 |
Loans assumed |  |  |  |  | 103,400 |
Etna Park 70 |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  |  | 90.00% |  |  |
Investment balance |  | 4,774 | $ 6,661 |  | $ 4,774 |
Payments to acquire interest in joint venture |  | $ 3,008 |  |  |  |
Area of real estate property | a |  | 57 |  |  | 57 | 151
Other Joint Ventures |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  |  | 25.00% |  |  |
Investment balance |  | $ 8,265 | $ 5,355 |  | $ 8,265 |
Non-consolidated Real Estate Entity |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage | 15.00% |  |  |  |  |

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