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)