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Leases - Weighted-average remaining lease term and discount rate (Details)
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating leases - Weighted-average remaining lease term (in years) 6 years 3 months 29 days 6 years 8 months 15 days
Operating leases - Weighted-average discount rate 5.77% 5.75%