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Summary of Significant Accounting Policies - Narrative (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 19, 2014 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jul. 01, 2016 USD ($) | Jun. 16, 2016 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |
Construction costs capitalization period after substantially complete |  | 1 year |  |  |  |
Capitalized personnel costs |  | $ 9,347,000 | $ 7,349,000 | $ 3,061,000 |  |
Capitalized interest |  | 11,307,000 | 6,516,000 | 6,938,000 |  |
Loss from discontinued operations |  | 0 | 0 | $ 164,000 |  |
Notes Receivable |  |  |  |  |  |
Notes receivable, maximum principal | $ 140,000,000.0 |  |  |  |  |
Notes receivable, share of maximum principal, percentage | 23.77% |  |  |  |  |
Notes receivable, share of maximum principal, amount | $ 33,300,000 |  |  |  |  |
Note receivable, interest rate | 11.00% |  |  |  |  |
Commitment fee earned | $ 400,000 |  |  |  |  |
Notes receivable from loan acquired |  | $ 0 | 28,684,000 |  |  |
Number of reportable segments | segment |  | 2 |  |  |  |
Income Taxes |  |  |  |  |  |
Income tax expense |  | $ 0 |  |  |  |
Investment in unconsolidated entities |  | 37,228,000 | $ 0 |  |  |
11601 Wilshire |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Joint venture, ownership percentage |  |  |  |  | 28.00% |
Investment in unconsolidated entities |  |  |  |  | $ 7,836,000 |
Santa Clara, CA Joint Venture |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Joint venture, ownership percentage |  |  |  |  |  | 21.00%
Investment in unconsolidated entities |  |  |  |  |  | $ 29,400,000
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09, Forfeiture Rate Component | Pro Forma |  |  |  |  |  |
Notes Receivable |  |  |  |  |  |
Cumulative effect of adoption of new accounting principle |  | $ 700,000 |  |  |  |
Building and improvements |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life |  | 39 years |  |  |  |
Land improvements |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life |  | 15 years |  |  |  |
Furniture and fixtures | Minimum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life |  | 5 years |  |  |  |
Furniture and fixtures | Maximum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life |  | 7 years |  |  |  |

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