Leases (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) lease	Jun. 30, 2019 USD ($)
Leases
Lessee, Operating Lease, Existence of Option to Extend [true false]	false
Operating lease costs	$ 3,055	$ 1,507
Non-cancelable operating lease commitments	$ 17,416
Weighted-average remaining lease term	8 years 9 months 29 days
Weighted-average discount rate of operating leases	3.72%
Number of financing leases | lease	0
Minimum
Leases
Term of operating leases	9 months
Maximum
Leases
Term of operating leases	10 years
Average lease term of non-cancelable operating lease commitments not yet commenced	9 years 3 months