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Leases (Summary Of Lease Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Amortization of property and equipment $ 211  
Interest expense on finance leases 32  
Total finance lease expense 243  
Operating lease expense 1,550  
Sublease income (228) $ (910)
Total lease expense $ 1,565