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Investment in and Advances to Non-Consolidated Entities - Schedule of Investment in Non-Consolidated Entities (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) building term | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) a
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment balance | $ 70,879 |  | $ 17,476
NNN Office Joint Venture [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Non-recourse debt | 466,200 |  |
Equity method investment, assets | 758,307 |  |
Equity method investment, liabilities | 490,451 |  |
NNN Office Joint Venture [Member] | Mortgages [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Non-recourse debt | $ 362,800 |  |
Long-term debt, term | 3 years |  |
Number of additional extensions available | term | 2 |  |
Term of additional extensions | 1 year |  |
Term of contract | 2 years |  |
NNN Office Joint Venture [Member] | Mortgages [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
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% |  |
NNN Office Joint Venture Properties [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Equity method investment, assets | $ 758,307 |  |
Equity method investment, liabilities | 490,451 |  |
Transferred Property [Member] | Office Building [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Aggregate gross disposition price | $ 967,799 | $ 190,368 |
Transferred Property [Member] | Office Building [Member] | NNN Office Joint Venture Properties [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Number of properties sold | building | 21 |  |
Aggregate gross disposition price | $ 725,800 |  |
Minimum [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Ownership percentage | 15.00% |  |
Maximum [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Ownership percentage | 25.00% |  |
NNN Office Joint Venture [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Ownership percentage | 20.00% |  |
Investment balance | $ 53,571 |  | 0
NNN Office Joint Venture [Member] | 2 of 21 Transferred Properties [Member] |  |  |
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 |  |
Transfer mortgage payable | $ 103,400 |  |
Etna Park 70 [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Ownership percentage | 90.00% |  |
Investment balance | $ 6,288 |  | 5,831
Payments to acquire interest in joint venture |  |  | $ 5,831
Area of real estate property | a |  |  | 151
Other Joint Ventures [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment balance | $ 11,020 |  | $ 11,645
Proceeds from collection of loans receivable |  |  | $ 49,085

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