Leases (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 3,239	$ 8,711
Short-term lease expense	277	850
Variable lease expense	555	1,671
Total lease expense	$ 4,071	$ 11,232
Weighted average remaining lease term	5 years 1 month 6 days	5 years 1 month 6 days
Weighted average discount rate (percent)	4.02%	4.02%
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