Leases - Lease Costs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Leases [Abstract]
Operating Lease Cost (Cost resulting from lease payments)	$ 6,253	$ 5,857
Variable Lease Cost (Cost excluded from lease payments)	720	815
Sublease Income	(261)	(282)
Net Lease Cost	6,712	6,390
Operating Lease - Operating Cash Flows (Fixed Payments)	6,648	6,382
Right-of-Use Assets - Operating Leases	$ 27,180	$ 26,552	$ 27,372
Weighted Average Lease Term - Operating Leases	5 years 3 months 7 days	5 years 1 month 9 days
Weighted Average Discount Rate - Operating Leases	4.00%	4.00%