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Income Taxes (Reconciliation Between The U.S. Federal Statutory Tax Rate And The Effective Tax Rate) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 21, 2017
Income Taxes [Abstract]      
Federal statutory tax rate 21.00%   35.00%
Effective tax rate 27.00% 37.50%  
Income Tax Expense (Benefit) $ 480 $ 3,700  
Effective federal statutory income tax rate change in amount $ 200