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Leases - Weighted-average Lease Terms and Discount Rates (Details)
Dec. 31, 2019
Leases  
Weighted-average remaining lease term - finance leases 4 years 9 months 18 days
Weighted-average discount rate - finance leases 1.62%
Weighted-average remaining lease term - operating leases 5 years 4 months 24 days
Weighted-average discount rate - operating leases 3.03%