Operating Leases - Narrative (Details)	9 Months Ended
	Sep. 30, 2019
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms of operating leases	2 years
Extension terms of operating leases	5 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms of operating leases	7 years
Extension terms of operating leases	10 years