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Income Taxes (Schedule Of Effective Income Tax Rate For Continuing Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]    
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 2,670 $ (5,647)
Income tax expense at federal statutory rate 21.00% 21.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount $ 982 $ 1,027
State taxes, net of federal income tax benefit 1.90% 1.10%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount $ 0 $ (601)
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount 35 40
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount $ (182) $ (205)
Changes in estimates related to prior year tax provision 0.00% 2.20%
Non-deductible expenses 1.20% (0.70%)
Research and development tax credit (1.40%) 0.80%
Foreign rate differences 7.70% (3.80%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount $ 239 $ (307)
Foreign tax incentives (11.50%) 6.20%
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount $ 33 $ 0
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent (0.30%) 0.00%
Valuation allowance for capital loss carry-forwards 0.30% (0.10%)
Effective Income Tax Rate Reconciliation, Deduction, Amount $ 3,097 $ 6,226
Effective income tax rate for income from continuing operations (24.40%) (23.20%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount $ 191 $ 251
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent 1.50% (0.90%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount $ 155 $ 190
Effective Income Tax Rate Reconciliation, Tax Credit, Amount (1,468) (1,676)
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income $ 508 $ 702
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income - Percentage 4.00% (2.60%)
Income Taxes [Line Items]    
Effective Income Tax Rate Reconciliation, Deduction, Amount $ 3,097 $ 6,226
Effective Income Tax Rate Reconciliation, Deduction, Percent 24.40% 23.20%