Income Taxes (Schedule Of Effective Income Tax Rate For Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount			$ 8,225	$ (1,833)
Income tax expense at federal statutory rate			21.00%	21.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount			$ 2,925	$ 2,425
State taxes, net of federal income tax benefit			1.50%	2.50%
Income tax contingency accruals and tax settlements			0.00%	1.70%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount			$ (450)	$ (592)
Unremitted earnings from foreign operations			0.00%	(1.70%)
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount			$ 132	$ 40
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount			$ (644)	$ (355)
Changes in estimates related to prior year tax provision			(1.10%)	6.80%
Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations, Amount			$ 0	$ (148)
Non-deductible expenses			1.00%	(3.40%)
Research and development tax credit			(1.60%)	4.10%
Foreign rate differences			7.50%	(27.90%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount			$ 584	$ (220)
Foreign tax incentives			(15.00%)	35.00%
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount			$ 33	$ 0
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent			(0.10%)	0.00%
Valuation allowance for capital loss carry-forwards			0.30%	(0.50%)
Effective Income Tax Rate Reconciliation, Deduction, Amount	$ 8,820			$ 2,366
Effective income tax rate for income from continuing operations			(22.50%)	(27.10%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount			$ 480	$ 247
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent			1.20%	(2.80%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount			$ 411	$ 293
Effective Income Tax Rate Reconciliation, Tax Credit, Amount			(5,872)	(3,041)
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income			$ 3,062	$ 670
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income - Percentage			7.80%	(7.70%)
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Deduction, Amount	$ 8,820			$ 2,366
Effective Income Tax Rate Reconciliation, Deduction, Percent	22.50%	27.10%
Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations			0.00%	(1.70%)
Income tax contingency accruals and tax settlements			0.00%	1.70%
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount			$ 0	$ (148)
Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations, Amount			$ 0	$ 148