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Lease Obligations (Schedule Of Future Minimum Lease Payments For Capitalized And Non-Cancelable Operating Leases) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Capitalized Leases    
Capitalized Leases, 2019 $ 1,099  
Capitalized Leases, 2020 1,011  
Capitalized Leases, 2021 736  
Capitalized Leases, 2023 752  
Capitalized Leases, 2022 752  
Capitalized Leases, Later years 5,990  
Capitalized Leases, Total minimum lease payments 10,340  
Capitalized Leases, Less: amounts representing imputed interest (3,294)  
Capitalized Leases, Present value of minimum lease payments 7,046  
Capitalized Leases, Less current portion of capitalized lease obligations (654) $ (644)
Capitalized Leases, Capitalized lease obligations, excluding current portion 6,392  
Operating Leases    
Operating Leases, 2019 15,123  
Operating Leases, 2020 9,153  
Operating Leases, 2021 6,997  
Operating Leases, 2022 5,847  
Operating Leases, 2023 5,095  
Operating Leases, Later years 7,707  
Operating Leases, Total minimum lease payments $ 49,922