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Leases - Lease Costs (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Leases      
Operating Lease Cost (Cost resulting from lease payments) $ 4,005 $ 3,898  
Variable Lease Cost (Cost excluded from lease payments) 518 535  
Sublease Income (174) (188)  
Net Lease Cost 4,349 4,245  
Operating Lease - Operating Cash Flows (Fixed Payments) 4,419 4,246  
Right-of-Use Assets - Operating Leases $ 25,368 $ 28,214 $ 27,372
Weighted Average Lease Term - Operating Leases 4 years 7 months 13 days 5 years 7 months 2 days  
Weighted Average Discount Rate - Operating Leases 4.00% 4.00%