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Lease Commitments - Leases outstanding - (Details)
Sep. 30, 2021
Dec. 31, 2020
Lease Commitments    
Operating Lease, Weighted-average remaining term 11 years 1 month 6 days 11 years 4 months 24 days
Financing Lease, Weighted-average remaining term 15 years 7 months 6 days 16 years
Operating Lease, Weighted-average discount rate 3.52% 3.49%
Financing Lease, Weighted-average discount rate 3.55% 3.52%