Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Finance lease cost:
Amortization of leased assets	$ 1,344	$ 1,189
Interest on lease liabilities	2,217	2,372
Operating lease cost	523	883
Total lease cost	$ 4,084	$ 4,444
Weighted-average remaining lease term (in years):
Finance leases	8 years 7 months 2 days		8 years 10 months 2 days
Operating leases	7 years 4 months 2 days		7 years 4 months 20 days
Weighted-average discount rate:
Finance leases	11.05%		11.05%
Operating leases	4.62%		5.12%