Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Fixed	$ 5,317	$ 5,325
Variable	107	112
Total	5,424	5,437
Property operating
Lessee, Lease, Description [Line Items]
Fixed	3,969	3,982
Variable	2	0
Total	3,971	3,982
General and administrative
Lessee, Lease, Description [Line Items]
Fixed	1,348	1,343
Variable	105	112
Total	$ 1,453	$ 1,455