Leases - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 9,133	$ 18,075
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms	1 year	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms	19 years	19 years