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Leases - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) item
Operating Leased Assets [Line Items] |  |  |
Variable lease revenues | $ 14,600 | $ 13,300 |
Operating lease, right-of-use asset | 59,386 |  | $ 60,006
Number of operating lease | item |  |  | 9
Number of finance lease | item |  |  | 4
Finance lease, right-of-use asset | 102,050 |  | $ 102,055
Reserves for credit losses | $ 2,500 |  |
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
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
Minimum |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease term | 1 month |  |
Maximum |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease term | 60 years |  |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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