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Leases Leases (Quantitative Information on Operating Leases) (Details)
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating Lease, Weighted Average Remaining Lease Term 5 years 9 months 18 days 6 years 6 months 21 days
Operating Lease, Weighted Average Discount Rate, Percent 3.03% 3.09%