Leases - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term - Operating leases (in years)	4 years 5 months 1 day
Termination period	1 year
Operating lease not yet commenced	$ 5.0
Minimum
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term - Operating leases (in years)	1 year
Maximum
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term - Operating leases (in years)	24 years 6 months
Extension period	10 years