Leases (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Jan. 01, 2019	Sep. 30, 2019	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Right-of-use assets		$ 29,038	$ 29,038
Lease liability		33,130	33,130
Activity related to the Company's leases
Operating lease expense		2,580	7,727
Cash for amounts included in the measurement of operating liability		$ 2,823	$ 8,460
Weighted average borrowing rate		2.90%	2.90%
Weighted average remaining lease term (years)		5 years 10 months 24 days	5 years 10 months 24 days
Minimum
Lessee, Lease, Description [Line Items]
Initial term of lease		3 years	3 years
Maximum
Lessee, Lease, Description [Line Items]
Initial term of lease		11 years	11 years
ASC 842
Lessee, Lease, Description [Line Items]
Package of practical expedients	true
ASC 842 | Adjustment
Lessee, Lease, Description [Line Items]
Right-of-use assets	$ 34,800
Lease liability	39,600
Deferred rent	$ 4,900