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Leases - Operating Leases - Additional Information (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 item | Dec. 31, 2019 USD ($) item shopping_center | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Operating Leased Assets [Line Items] |  |  |  |
Variable lease revenues |  | $ 56,400 |  |
Cumulative effect adjustment to retained earnings required upon adoption of the new standard |  | 0 |  |
Operating lease, right-of-use asset |  | $ 60,006 |  |
Number of operating lease | item |  | 9 |  |
Number of finance lease | item |  | 4 |  |
Finance lease, right-of-use asset |  | $ 102,055 |  |
Number of shopping centers with land leases | shopping_center |  | 6 |  |
Ground lease expense |  |  | $ 1,700 | $ 1,400
Rent expense capitalized |  |  | 0 | 100
Rent expense |  |  | 1,000 | 1,000
Capital lease term |  | 49 years |  |
565 Broadway | Core Portfolio |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease, right-of-use asset |  | $ 4,900 |  |
Finance lease, right-of-use asset |  | 19,400 |  |
110 University Place |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease, right-of-use asset |  | 45,300 |  |
Operating lease liabilities |  | 45,300 |  |
Capital Lease Liability |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Finance lease liabilities |  | 71,100 |  |
Repayments capital lease obligations |  |  | $ 2,500 | $ 2,500
Ground, Office and Equipment Leases |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease, right-of-use asset |  | 82,600 |  |
Operating lease liabilities |  | 76,600 |  |
Capital Leases Asset |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Finance lease, right-of-use asset |  | 77,000 |  |
Accounting Standards Update 2016-02 |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease, right-of-use asset |  | 11,900 |  |
Operating lease liabilities |  | 12,800 |  |
Number of finance lease | item | 3 |  |  |
Finance lease, right-of-use asset |  | $ 5,700 |  |
Minimum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease term |  | 1 month |  |
Period of lease term |  |  | 25 years |
Maximum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease term |  | 60 years |  |
Period of lease term |  |  | 71 years |

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