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Leases - Narrative (Details)
6 Months Ended
Jun. 30, 2019
Lessee, Lease, Description [Line Items]  
Operating lease, renewal term 5 years
Operating lease, termination period 1 year
Minimum  
Lessee, Lease, Description [Line Items]  
Operating lease, term of contract 1 year
Maximum  
Lessee, Lease, Description [Line Items]  
Operating lease, term of contract 15 years