Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Leases [Abstract]
Short-term lease costs (less than)	$ 100
Net lease assets	25,251			$ 25,600
Lease liability	27,854			$ 27,800
Operating lease expense	5,400
Finance lease expense	100
Operating lease expense		$ 5,200
Finance lease expense		100
Measurement of lease liability	5,000
Lease not yet commenced, liability	$ 2,100
Term of contract	4 years 3 months 18 days
Rent expense		$ 5,500	$ 5,600