Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 2,635
Short-term lease expense	246
Variable lease expense	514
Total lease expense	$ 3,395
Weighted average remaining lease term	5 years 3 months 15 days
Weighted average discount rate (percent)	4.03%
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	10 years