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Real Estate Investments - Purchase Price Allocation (Parenthetical) (Details) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 11, 2018 | Jan. 05, 2018 | Oct. 13, 2017 | Jul. 28, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |
Outstanding principal balances on mortgage debt assumed |  |  |  |  | $ 320,869 | $ 317,216 |
Repayments of mortgage debt assumed |  |  |  |  | $ 122,180 | $ 4,931 | $ 357,151
Mortgage Debt Assumed - at Fair Value [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Outstanding principal balances on mortgage debt assumed | $ 115,500 |  |  |  |  |  |
Repayments of mortgage debt assumed | $ 115,500 |  |  |  |  |  |
Four Tower Bridge [Member] | Mortgage Debt Assumed - at Fair Value [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Outstanding principal balances on mortgage debt assumed |  | $ 9,700 |  |  |  |  |
Four Tower Bridge [Member] | Intangible Assets Acquired [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  | 4 years 1 month 6 days |  |  |  |  |
Four Tower Bridge [Member] | Below Market Lease [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  | 4 years 9 months 18 days |  |  |  |  |
Bulletin Building [Member] | Intangible Assets Acquired [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  | 7 years 10 months 24 days |  |  |  |
Bulletin Building [Member] | Below Market Lease [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  | 7 years |  |  |  |
3000 Market Street [Member] | Intangible Assets Acquired [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  |  | 5 years 10 months 24 days |  |  |
3000 Market Street [Member] | Below Market Lease [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization period |  |  |  | 6 years |  |  |

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