Leases - Narrative (Details)	3 Months Ended
	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Term of lease not commenced	20 years
Minimum
Lessee, Lease, Description [Line Items]
Renewal term	5 years
Maximum
Lessee, Lease, Description [Line Items]
Lease term	20 years
Renewal term	10 years