Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finance lease cost
Amortization of ROU assets	$ 2,540	$ 1,993
Interest on lease liabilities	4,257	3,255
Operating lease cost	6,663	7,136
Short-term lease cost	73	17
Variable lease cost	740	625
Sublease income	(101)	(13)
Total lease cost	14,172	13,013
Related party rent included in operating lease cost	$ 4,700	$ 4,700