Leases - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Letters of credit outstanding, amount related to leases	$ 4,018
Minimum
Lessee, Lease, Description [Line Items]
Renewal terms for extending lease	1 year
Maximum
Lessee, Lease, Description [Line Items]
Renewal terms for extending lease	10 years