Leases (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	$ 2,837	$ 5,472
Short-term lease expense	327	573
Variable lease expense	602	1,116
Total lease expense	$ 3,766	$ 7,161
Weighted average remaining lease term	5 years 7 months 6 days	5 years 7 months 6 days
Weighted average discount rate (percent)	4.03%	4.03%
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	10 years	10 years