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Leases - Narrative (Details)
Mar. 31, 2019
Minimum  
Lessee, Lease, Description [Line Items]  
Operating lease, term of contract 1 year
Sublease, term of contract 1 year
Maximum  
Lessee, Lease, Description [Line Items]  
Operating lease, term of contract 13 years
Sublease, term of contract 13 years