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Income Taxes (Summary of Effective Income Tax Rate For Continuing Operations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income tax expense (benefit) at federal statutory rate $ (5,260) $ 15,121 $ 16,878
Federal statutory rate 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income $ 1,409 $ 16,029 $ 2,229
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income - Percentage (5.60%) 22.30% 2.80%
State taxes, net of federal income tax benefit 1.50% 1.50% 1.50%
Non-deductible expenses (0.90%) 0.40% 0.10%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount $ (24) $ 292 $ 177
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent 0.10% 0.40% 0.20%
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ 4,787 $ 1,999 $ (1,340)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 19.10% (2.80%) (1.70%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount $ 219 $ 285 $ 99
Foreign rate differences (14.90%) 1.90% 2.10%
effective income tax rate reconciliation, valuation allowance due to foreign losses $ 0 $ (14,350) $ (2,162)
Effective Income Tax Rate Reconciliation, Valuation Allowance Due To Foreign Losses And Impairments, Percentage 0.00% (19.90%) (2.70%)
Effective Income Tax Rate Reconciliation Amount - FDII $ 0 $ (319) $ (695)
Effective Income Tax Rate Reconciliation Percent - FDII 0.00% (0.40%) (0.90%)
Effective Income Tax Rate Reconciliation, Valuation Allowance Due To Foreign Losses, Percentage (0.20%) 0.10% 0.70%
Research and development tax credit 2.50% (0.70%) (0.20%)
Changes in estimates related to prior year tax provision 9.90% (0.20%) (0.50%)
Goodwill impairment (0.10%) 0.10% 0.20%
Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations, Amount $ 13 $ 60 $ 126
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount 52 60 553
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount $ (58) $ (2,543) $ 673
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Percent 0.20% (3.50%) 0.80%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount $ (633) $ (523) $ (130)
Changes in estimates related to prior year tax provision (2,472) (135) (380)
State taxes, net of federal income tax benefit (373) 1,050 1,203
Foreign rate differences 3,753 1,533 1,576
Income tax expense (benefit) at effective income tax rate 8,213 (13,545) (18,807)
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount $ (52) $ (1,016) $ 0
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent 0.20% (1.40%) 0.00%
Income tax expense (benefit) at effective income tax rate $ (8,213) $ 13,545 $ 18,807
Effective Income Tax Rate Reconciliation, Deduction, Percent 32.80% 18.80% 23.40%