Leases Leases (Schedule of certain lease terms) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Weighted average discount rate	3.36%	3.67%
Weighted average remaining lease term	13 years 7 months 6 days	14 years
Minimum [Member]
Lease Expiration Period	10 months	4 months
Range of lease renewal options	1 year	1 year
Maximum [Member]
Lease Expiration Period	20 years	21 years
Range of lease renewal options	5 years	5 years