Leases - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) lease
Lessee, Lease, Description [Line Items]
Remaining lease terms (up to)	42 years
Number of operating leases not yet commenced | lease	2
Initial lease liability of operating leases that have not yet commenced | $	$ 2.6
Minimum
Lessee, Lease, Description [Line Items]
Term of operating lease that has not yet commenced	3 years
Maximum
Lessee, Lease, Description [Line Items]
Term of operating lease that has not yet commenced	5 years