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Summary of Significant Accounting Policies - Schedule of Computation of Initial Right-of-use Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019
--- | --- | ---
Leases [Line Items] |  |
Lease liabilities | $ 333,312 | $ 278,287
Reclassifications: |  |
Right-of-use assets | $ 481,044 | 434,201
Other Assets [Member] |  |
Reclassifications: |  |
Prepaid ground leases |  | 17,886
Ground lease intangibles – below market, net |  | 166,230
Other Liabilities [Member] |  |
Reclassifications: |  |
Ground lease intangibles – above market, net |  | (2,110)
Straight line rent liabilities |  | $ (26,092)

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + 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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