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Leases (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Lessee, Lease, Description [Line Items]    
Total minimum future lease payments $ 4.4  
Rent expense $ 5.4 $ 5.2
Minimum    
Lessee, Lease, Description [Line Items]    
Operating lease not yet commenced, lease term 5 years  
Maximum    
Lessee, Lease, Description [Line Items]    
Operating lease not yet commenced, lease term 11 years