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Leases Lease: Terms (Details)
12 Months Ended
Dec. 31, 2019
Lessee, Lease, Description [Line Items]  
Minimum initial term of real estate leases 1 year
Real Estate Leases, Cancellation Notice, Latest Notice 30 days
Real Estate Leases, Cancellation Notice, Earliest Notice 90 days
Minimum [Member]  
Lessee, Lease, Description [Line Items]  
Operating leases, renewal term 1 year
Maximum [Member]  
Lessee, Lease, Description [Line Items]  
Operating leases, renewal term 10 years