Income Taxes (Schedule Of Effective Income Tax Rate For Continuing Operations) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ (3,066,000)	$ 8,972,000
Income tax expense at federal statutory rate	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	$ 2,510,000	$ 1,191,000
State taxes, net of federal income tax benefit	1.20%	1.10%
Income tax contingency accruals and tax settlements	1.00%	(0.40%)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	$ (592,000)	$ 152,000
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount	$ 40,000	$ 0
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	(0.90%)	0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ (487,000)	$ (255,000)
Changes in estimates related to prior year tax provision	4.10%	0.40%
Non-deductible expenses	(2.60%)	0.60%
Valuation allowance for foreign operating loss carry-forwards	1.40%	(3.70%)
Research and development tax credit	3.30%	(0.70%)
Foreign rate differences	(17.00%)	3.30%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	$ (179,000)	$ 468,000
Foreign tax incentives	18.00%	(3.00%)
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount	$ 0	$ (919,000)
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent	0.00%	(2.20%)
effective income tax rate reconciliation, valuation allowance due to foreign losses	$ (209,000)	$ (1,353,000)
Valuation allowance for capital loss carry-forwards	(0.30%)	0.00%
Effective Income Tax Rate Reconciliation, Deduction, Amount	$ 3,477,000	$ (8,467,000)
Effective income tax rate for income from continuing operations	(23.80%)	(19.80%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount	$ 247,000	$ (141,000)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent	(1.70%)	(0.40%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	$ 375,000	$ 217,000
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount	(148,000)	(154,000)
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	(128,000)	0
Effective Income Tax Rate Reconciliation Amount - FDII	$ 0	$ (445,000)
Effective Income Tax Rate Reconciliation Percent - FDII	0.00%	(1.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	$ (2,630,000)	$ 1,074,000
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income	$ 534,000	$ 1,808,000
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income - Percentage	(3.70%)	5.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 128,000	$ 0