Commitments and Contingencies - Leases Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Operating lease right of use asset	$ 15,680
Operating lease liability	19,467
Lease expense for operating leases	13,000	$ 10,900	$ 9,900
Operating lease payments	$ 7,000
Minimum
Lessee, Lease, Description [Line Items]
Operating leases, initial lease terms	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating leases, initial lease terms	12 years