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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Income Tax [Line Items]              
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent         31.50% 35.00% 35.00%
Continuing operations         $ 50,509 $ 56,732 $ 54,430
Unrecognized tax benefits that would impact effective tax rate $ 3,600       3,600    
Liability where a significant change in unrecognized tax benefits is reasonably possible 100       $ 100    
Minimum [Member] | State And Foreign Jurisdictions [Member]              
Income Tax [Line Items]              
Open tax years         3 years    
Maximum [Member] | State And Foreign Jurisdictions [Member]              
Income Tax [Line Items]              
Open tax years         6 years    
Prior to Tax Cuts and Jobs Act [Member]              
Income Tax [Line Items]              
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     35.00%        
Subsequent to Tax Cuts and Jobs Act [Member]              
Income Tax [Line Items]              
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%        
Continuing operations (6,000) $ 10,500   $ 10,500 $ 4,500    
Foreign Earnings Repatriated         10,000    
Long Term Liabilities, Undistributed Foreign Earnings $ 15,800       15,800    
Net Income [Member] | Subsequent to Tax Cuts and Jobs Act [Member]              
Income Tax [Line Items]              
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability         7,800    
Retained Earnings [Member]              
Income Tax [Line Items]              
Reclassification of Tax Effects out of Accumulated Other Comprehensive Income [1]         $ 12,373    
[1] In the fourth quarter of fiscal year 2018, the Company adopted FASB Accounting Standards Update 2018-02, which addressed the disproportionate income tax effects on pretax amounts recorded in accumulated other comprehensive income (loss) arising from the enactment of the Tax Cuts and Jobs Act of 2017. With the adoption of ASU 2018-02, the disproportionate tax effects were reclassified to retained earnings, and the resulting tax effects remaining in accumulated other comprehensive income (loss) are reflective of the rates which those amounts will ultimately be taxed.