Leases (Schedule of Certain Lease Terms) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Weighted average discount rate	3.34%	3.67%
Weighted average remaining lease term	13 years 4 months 24 days	14 years
Minimum [Member]
Range of lease expiration dates	7 months	4 months
Range of lease renewal options	1 year	1 year
Maximum [Member]
Range of lease expiration dates	20 years	21 years
Range of lease renewal options	5 years	5 years