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Lease Obligations (Summary of Maturity of Lease Obligations for Operating Leases) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Lease Obligations [Abstract]      
One year or less $ 3,358 $ 3,348  
Over one year through three years 5,225 5,424  
Over three years through five years 3,269 3,459  
Over five years 4,065 4,415  
Gross Operating Lease Liabilities 15,917 16,646  
Deferred Expenses (1,328) (1,422)  
Total Operating Lease Liabilities $ 14,589 $ 15,224 $ 15,224