Leases Narrative (Details) $ in Thousands		3 Months Ended			6 Months Ended
	May 19, 2021 USD ($) ft²	Jun. 30, 2021 USD ($)		Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)		Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Lessor, Lease, Description [Line Items]
Write-off for accrued rent		$ 600		$ 35,900	$ 1,200		$ 37,400
Write-off for accounts receivable		300		18,000	100		18,900
Operating Lease, Payments					1,566		(799)
Right of use assets - operating leases		170,331	[1]		170,331	[1]		$ 146,406
Sumner Square
Lessor, Lease, Description [Line Items]
Lessee, Operating Lease, Description	The amendment extends the ground lease for an additional 15 years. Prior to the amendment, the ground lease was scheduled to expire on August 10, 2066. The ground lease will now expire on August 9, 2081.
Operating Lease, Payments	$ 23,000
Lessee Operating Lease Liability Payments Due, Next Five Years	$ 4,000
Lessee, Operating Lease, Discount Rate	3.95%
Right of use assets - operating leases	$ 27,100
Operating lease costs		$ 200		$ 300	$ 500		$ 700
Net Rentable Area (in sf) | ft²	210,000
Operating Lease, Liability	$ 26,700

[1] See Note 4.