Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Lease Cost
Amortization of leased assets	$ 1,516	$ 1,344
Interest on lease liabilities	2,044	2,217
Operating lease cost:	270	523
Total leased cost	$ 3,830	$ 4,084
Weighted-average remaining lease term (in years)
Finance leases	7 years 7 months 9 days		7 years 10 months 9 days
Operating leases	7 years 6 months		7 years 3 months 7 days
Weighted-average discount rate:
Finance leases	11.05%		11.05%
Operating leases	4.69%		4.63%