Leases - Lease Costs and Other Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Leases [Abstract]
Operating Lease Cost (Cost resulting from lease payments)	$ 4,172	$ 4,005
Variable Lease Cost (Cost excluded from lease payments)	473	518
Sublease Income	(174)	(174)
Net Lease Cost	4,471	4,349
Operating Lease - Operating Cash Flows (Fixed Payments)	4,352	4,419
Right-of-Use Assets - Operating Leases	$ 29,066	$ 25,368	$ 25,237
Weighted Average Lease Term - Operating Leases	6 years 1 month 28 days	4 years 7 months 13 days
Weighted Average Discount Rate - Operating Leases	3.33%	4.00%