Summary of Significant Accounting Policies - Schedule of Computation of Initial Right-of-use Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Line Items]
Lease liabilities	$ 281,620	$ 278,287	$ 0
Reclassifications:
Right-of-use assets	$ 431,753	434,201	$ 0
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)