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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
Dec. 31, 2016
Federal statutory rate     35.00% 35.00%
Reclassification from AOCL to retained earnings resulting from Tax Act     $ 0  
Subsequent Event [Member]        
Reclassification from AOCL to retained earnings resulting from Tax Act $ 4,400      
Scenario, Plan [Member]        
Federal statutory rate   21.00%    
Tax expense resulting from adjustment of deferred tax balance to reflect new statutory rate     3,200  
MARYLAND [Member]        
Operating loss carryforwards     39,500  
Deferred tax assets, operating loss carryforwards, state and local     2,400  
Operating loss carryforward, valuation allowance     2,400  
Valuation allowance, deferred tax asset, change in amount     500  
WEST VIRGINIA [Member]        
Operating loss carryforwards     3,900  
Deferred tax assets, operating loss carryforwards, state and local     200  
Internal Revenue Service (IRS) [Member]        
Operating loss carryforwards     3,800  
Deferred tax assets, operating loss carryforwards, domestic     $ 800