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Leases - Lease Costs and Other Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Leases [Abstract]          
Operating Lease Cost (Cost resulting from lease payments) $ 1,960 $ 2,248 $ 6,132 $ 6,253  
Variable Lease Cost (Cost excluded from lease payments) 205 202 678 720  
Sublease Income (117) (87) (291) (261)  
Net Lease Cost 2,048 2,363 6,519 6,712  
Operating Lease - Operating Cash Flows (Fixed Payments) 1,992 $ 2,229 6,344 $ 6,648  
Right-of-Use Assets - Operating Leases $ 30,080   $ 30,080   $ 25,237
Weighted Average Lease Term - Operating Leases 6 years 2 months 19 days   6 years 2 months 19 days   6 years 2 months 12 days
Weighted Average Discount Rate - Operating Leases 3.14%   3.14%   4.00%