Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 23, 2021	Jan. 01, 2019
Lessor, Lease, Description
Straight line rental income	$ 6,069	$ 4,508	$ 10,227
Straight line rental income, excluding properties held-for-sale	104,803	99,297
Variable lease, payment	77,599	78,668	82,001
Reimbursement revenue lease	4,722	4,904	$ 5,048
Increase in accounts receivable	1,486
Operating lease, right-of-use asset	$ 4,237	$ 4,319			$ 4,507
Operating Lease, Right-of-Use Asset, Statement of Financial Position	us-gaap:OtherAssets	us-gaap:OtherAssets
Operating lease, liability	$ 4,410	$ 4,461			$ 4,507
Operating Lease, Liability, Statement of Financial Position	us-gaap:OtherLiabilities	us-gaap:OtherLiabilities			us-gaap:OtherLiabilities
Subsequent Event
Lessor, Lease, Description
Deferred rent credit				$ 2,117