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Leases - Weighted average remaining lease term and weighted average discount rate (Details)
3 Months Ended
Mar. 31, 2020
Leases  
Operating lease, Weighted average remaining lease term (in years) 3 years 9 months 18 days
Operating lease, Weighted average discount rate 2.30%
Finance lease, Weighted average remaining lease term (in years) 3 years 8 months 12 days
Finance lease, Weighted average discount rate 1.70%
Sublease, remaining lease term (in years) 10 months 24 days