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Lease Obligations (Summary of Maturity of Operating and Finance Leases) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Lease Obligations [Abstract]    
One year or less $ 2,731 $ 2,590
Over one year through three years 4,528 4,713
Over three years through five years 2,615 2,736
Over five years 3,647 3,341
Total $ 13,521 $ 13,380