Leases - Weighted Average Lease Terms and Discount Rates (Details)	Sep. 30, 2021	Dec. 31, 2020
Weighted average remaining lease term (in years):
Operating leases	7 years 8 months 12 days	7 years 9 months 18 days
Finance leases	30 years	31 years 2 months 12 days
Weighted average discount rate:
Operating leases	5.50%	5.60%
Finance leases	7.20%	7.20%