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Leases (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Lessee, Lease, Description [Line Items]    
Option to extend, term 10 years  
Option to terminate, term 1 year  
Weighted average remaining lease term 4 years  
Weighted average discount rate 5.35%  
Rent expense $ 3.4 $ 3.3
Minimum    
Lessee, Lease, Description [Line Items]    
Remaining lease term 1 year  
Maximum    
Lessee, Lease, Description [Line Items]    
Remaining lease term 8 years