Lease Accounting - Leasing as a Lessee Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Operating ground lease remaining lease term (in years)	51 years		51 years
Straight-line rental expense	$ 100	$ 100	$ 200	$ 200
Variable rental payments	200	200	700	700
Right-of-use asset					$ 4,200
Lease liability	3,790		3,790		$ 4,200
Operating lease discount rate					5.90%
Right-of-use asset and lease liability amortization	$ 100	$ 100	$ 200	$ 200
Right-of-use asset, statement of financial position line item					us-gaap:RentalProperties
Lease liability, statement of financial position line item					us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent