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Leases - Narrative (Details) - renew
3 Months Ended
Mar. 31, 2018
Mar. 31, 2019
Lessee, Lease, Description [Line Items]    
Operating lease term   12 months
Lease option to renew (or more) 1  
Lease renewal term (not to exceed)   20 years
Weighted average remaining lease term for operating leases   8 years
Weighted average discount rate   7.74%
Minimum    
Lessee, Lease, Description [Line Items]    
Operating lease term   1 year
Maximum    
Lessee, Lease, Description [Line Items]    
Operating lease term   20 years