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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Feb. 28, 2018
Dec. 31, 2018
Dec. 31, 2017
Federal statutory rate   21.00% 35.00%
Reclassification from AOCL to retained earnings resulting from Tax Act $ 4,400   $ 0
Scenario, Plan [Member]      
Tax expense resulting from adjustment of deferred tax balance to reflect new statutory rate   $ 3,200  
MARYLAND [Member]      
Operating loss carryforwards   40,100  
Deferred tax assets, operating loss carryforwards, state and local   2,400  
Operating loss carryforward, valuation allowance   2,400 $ 2,400
WEST VIRGINIA [Member]      
Operating loss carryforwards   1,700  
Deferred tax assets, operating loss carryforwards, state and local   $ 100