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Leases - Lease Term and Discount Rates (Details)
Sep. 30, 2019
Dec. 31, 2018
Weighted-Average Remaining Lease Term (Years)    
Operating Leases 5 years 8 months 12 days  
Finance Leases   7 years 8 months 12 days
Weighted-Average Discount Rate    
Operating Leases 4.40%  
Finance Leases   5.02%