Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Operating leases:
Operating lease ROU assets	$ 57,554	$ 54,457
Current operating lease liabilities	13,593	10,663
Noncurrent operating lease liabilities	27,621	27,041
Total operating lease liabilities	41,214	37,704
Finance leases:
Finance lease ROU assets	2,551	2,507
Accumulated amortization	(2,521)	(2,298)
Finance lease ROU assets, net	30	209
Current finance lease liabilities	12	149
Non-current finance lease liabilities	18	24
Total finance lease liabilities	$ 30	$ 173
Weighted average remaining lease term (in years):
Operating leases	6 years 10 months 24 days	7 years 7 months 6 days
Finance leases	2 years 6 months	7 months 6 days
Weighted average discount rate:
Operating leases	4.00%	4.00%
Finance leases	3.70%	3.10%