Leases - Supplemental Balance Sheet and Other Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Finance Lease, Right-of-Use Asset	$ 124,926	$ 119,787
Operating leases:
Operating Lease, Liability	$ 144,259	$ 139,501
Weighted average remaining lease term (in years)	5 years 8 months 12 days	5 years 9 months 18 days
Weighted average discount rate	2.27%	2.54%