Leases - Summary of Right-of-Use Assets and Related Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Operating Leased Assets [Line Items]
Right-of-use assets	$ 481,044	$ 434,201
Lease liabilities	333,312	$ 278,287
Corporate Office Leases [Member]
Operating Leased Assets [Line Items]
Right-of-use assets	43,739
Lease liabilities	45,237
Ground Leases [Member]
Operating Leased Assets [Line Items]
Right-of-use assets	414,104
Finance lease, right-of-use asset	23,201
Lease liabilities	264,865
Finance lease, liabilities	$ 23,210