Commitments and Contingencies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Lease expiration month and year	2021-02
Lease extension option period	one year
2020	$ 530,000
2021	$ 89,000
Weighted average remaining lease term	32 years 4 months 24 days
Weighted average discount rate	5.70%
Rent expense	$ 1,700,000	$ 1,100,000	$ 1,100,000