Leases (Schedule of weighted average discount rate for leases) (Details)	Dec. 31, 2020
Leases [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	1 year 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	4.41%	[1]
Finance Lease, Weighted Average Remaining Lease Term	8 months 12 days
Finance Lease, Weighted Average Discount Rate, Percent	4.00%	[1]

[1] Our weighted average discount rates represent the rate implicit in the lease or our incremental borrowing rate for a term equal to the remaining term of the lease.