Leases Lease Term and Discount Rate (Details)	Dec. 31, 2020	Dec. 31, 2019
Weighted-Average Remaining Lease Term
Operating leases	3 years 8 months 12 days	4 years 10 months 24 days
Finance leases	3 years 1 month 6 days	3 years 10 months 24 days
Weighted-Average Discount Rate
Operating leases	3.10%	3.90%
Finance leases	11.40%	11.10%