Fair Value of Financial Instruments - Financial Instruments Disclosed at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ground lease liability	$ 10,877	$ 10,882
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Secured notes payable	4,724,042	4,678,623
Ground lease liability	14,284	12,218
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Secured notes payable	4,707,591	4,653,264
Ground lease liability	$ 10,877	$ 10,882