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Income Taxes (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Income Tax Contingency [Line Items]      
Valuation allowance $ 0 $ 0 $ 5,441,000
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount 5,400,000    
Estimated reduction in uncertain tax provisions, next 12 months   600,000  
Foreign      
Income Tax Contingency [Line Items]      
Long-term deferred tax assets $ 1,200,000 $ 1,200,000 $ 900,000