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Leases - Operating Leases - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) shopping_center | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) item shopping_center | Sep. 30, 2018 USD ($)
Operating Leased Assets [Line Items] |  |  |  |
Variable lease revenues | $ 14,700 |  | $ 41,200 |
Cumulative effect adjustment to retained earnings required upon adoption of the new standard | 0 |  | 0 |
Operating lease, right-of-use asset | 55,717 |  | $ 55,717 |
Number of operating lease | item |  |  | 9 |
Number of finance lease | item |  |  | 4 |
Finance lease, right-of-use asset | 93,796 |  | $ 93,796 |
Finance lease, liability | 88,137 |  | 88,137 |
Operating lease liabilities | $ 57,093 |  | 57,093 |
Acquisition of real estate |  |  | $ 256,647 | $ 104,902
Number of shopping centers with land leases | shopping_center | 6 |  | 6 |
Ground lease expense |  |  |  | 1,200
Rent expense capitalized |  |  |  | 500
Rent expense |  |  |  | 700
Capital lease term |  |  | 49 years |
1238 Wisconsin Avenue | Core Portfolio |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Finance lease, right-of-use asset |  | $ 11,200 |  |
Finance lease, liability |  | 10,700 |  |
110 University Place |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease, right-of-use asset |  | 45,300 |  |
Operating lease liabilities |  | 45,300 |  |
Acquisition of real estate |  | $ 10,500 |  |
Capital Lease Liability |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Finance lease liabilities | $ 71,100 |  | $ 71,100 |
Finance lease, liability | 71,100 |  | 71,100 |
Repayments capital lease obligations |  |  |  | $ 1,900
Ground, Office and Equipment Leases |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease, right-of-use asset | 82,600 |  | 82,600 |
Operating lease liabilities | 76,600 |  | 76,600 |
Capital Leases Asset |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Finance lease, right-of-use asset | 77,000 |  | 77,000 |
Accounting Standards Update 2016-02 |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease, right-of-use asset | 11,900 |  | 11,900 |
Operating lease liabilities | 12,800 |  | 12,800 |
Finance lease, right-of-use asset | 5,700 |  | 5,700 |
Finance lease, liability | $ 5,700 |  | $ 5,700 |
Minimum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease term | 1 month |  | 1 month |
Period of lease term |  |  | 25 years |
Maximum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease term | 60 years |  | 60 years |
Period of lease term |  |  | 71 years |

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