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Leases - Weighted average remaining lease term and weighted average discount rate (Details)
12 Months Ended
Dec. 31, 2019
Leases  
Operating lease, Weighted average remaining lease term (in years) 4 years 1 month 6 days
Operating lease, Weighted average discount rate 2.30%
Finance lease, Weighted average remaining lease term (in years) 3 years 10 months 24 days
Finance lease, Weighted average discount rate 1.70%
Sublease, remaining lease term (in years) 1 year 2 months 12 days