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Investment in Real Estate - Properties Disposed (Details) $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 27, 2018 USD ($) ft² | Apr. 10, 2018 USD ($) ft² | Mar. 01, 2018 USD ($) ft² | Jan. 31, 2018 USD ($) ft² | Jan. 25, 2018 USD ($) ft² | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) ft² | Sep. 30, 2017 USD ($)
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Square feet of real estate disposed | ft² |  |  |  |  |  |  |  | 815,226 |
Sales Price |  |  |  |  |  |  |  | $ 464,800 |
Gains on sale of real estate |  |  |  |  |  | $ 3,735 | $ 0 | $ 43,337 | $ 16,866
Embarcadero Place |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Square feet of real estate disposed | ft² |  |  |  |  | 197,402 |  |  |  |
Sales Price |  |  |  |  | $ 136,000 |  |  |  |
2600 Campus Drive (building 6 of Peninsula Office Park) |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Square feet of real estate disposed | ft² |  |  |  | 63,050 |  |  |  |  |
Sales Price |  |  |  | $ 22,500 |  |  |  |  |
2180 Sand Hill |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Square feet of real estate disposed | ft² |  |  | 45,613 |  |  |  |  |  |
Sales Price |  |  | $ 82,500 |  |  |  |  |  |
9300 Wilshire |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Square feet of real estate disposed | ft² |  | 61,422 |  |  |  |  |  |  |
Sales Price |  | $ 13,800 |  |  |  |  |  |  |
Peninsula Office Park |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Square feet of real estate disposed | ft² | 447,739 |  |  |  |  |  |  |  |
Sales Price | $ 210,000 |  |  |  |  |  |  |  |

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- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-15.(a)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027 + Details
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