Leases (Schedule of Lease Terms and Discount Rates Related to Leases) (Details)	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease, weighted average remaining lease term	9 years 8 months 12 days	9 years 9 months 18 days
Finance lease, weighted average remaining lease term	9 years 10 months 24 days	10 years 10 months 24 days
Operating lease, weighted average discount rate, percent	2.56%	3.06%
Finance lease, weighted average discount rate, percent	4.52%	4.69%