Leases - Balance Sheet Information and Weighted-Average Lease Terms and Discount Rates Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Finance lease right-of-use assets, net of accumulated depreciation	$ 6,405	$ 7,471
Finance lease liabilities	6,826	7,805
Operating lease right-of-use assets	34,689	30,901
Operating lease liabilities	$ 36,531	$ 32,290
Weighted-average lease term:
Finance leases	8 years 4 months 9 days	8 years 6 months 10 days
Operating leases	8 years 11 months 19 days	8 years 7 months 24 days
Weighted-average discount rate:
Finance leases	3.19%	3.10%
Operating leases	3.14%	3.41%