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v3.19.1

Investment in and Advances to Non-Consolidated Entities - Schedule of Investments in and Non-consolidated Entities (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) a property partnership term | Dec. 31, 2018 USD ($) a building partnership term | Dec. 31, 2017 USD ($) a | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 66,183 | $ 66,183 | $ 17,476 |
Proceeds from sale of property |  | 898,514 | 223,853 | $ 370,038
Payments to acquire interest in joint venture |  | 0 | 7,951 | $ 0
Real estate, at cost | 3,090,134 | 3,090,134 | 3,936,459 |
NNN Office Joint Venture [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Non-recourse debt | 466,200 | 466,200 |  |
Mortgages [Member] | NNN Office Joint Venture [Member] |  |  |  |
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 [Member] | NNN Office Joint Venture [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Basis spread on variable rate |  | 2.00% |  |
Basis spread rate increase per extension |  | 0.15% |  |
Cap interest rate | 4.00% | 4.00% |  |
Office Building [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of properties sold | property | 6 |  |  |
NNN Office Joint Venture Properties [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments, assets | $ 757,811 | $ 757,811 |  |
Equity method investments, liabilities | $ 492,091 | $ 492,091 |  |
NNN Office Joint Venture Properties [Member] | Office Building [Member] | Transferred Property [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of properties sold | building |  | 21 |  |
Proceeds from sale of property |  | $ 725,800 |  |
Minimum [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 15.00% | 15.00% |  |
Maximum [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 25.00% | 25.00% |  |
NNN Office Joint Venture [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 20.00% | 20.00% |  |
Equity method investments | $ 53,144 | $ 53,144 | 0 |
NNN Office Joint Venture [Member] | 2 of 21 Transferred Properties [Member] |  |  |  |
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 |  |
Etna Park 70 [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 90.00% | 90.00% |  |
Equity method investments | $ 4,774 | $ 4,774 | $ 5,831 |
Etna GL 66 LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Area of land (in acres) | a | 57 | 57 | 151 |
Real estate, at cost | $ 3,008 | $ 3,008 |  |
Other Joint Ventures [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 8,265 | $ 8,265 | $ 11,645 |
Number of joint venture interests | partnership | 2 | 2 |  |
Proceeds from collection of loans receivable |  |  | $ 49,085 |

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