Income Taxes (Schedule Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Abstract]
Accounts receivable	$ 4	$ 357
Accrued expenses and other current liabilities	791	422
Stock-based compensation	997	1,026
Other	133	86
Net operating loss carry forwards	2,503	21,087
Gross deferred tax assets	4,428	22,978
Valuation allowance	(1,363)
Net deferred tax assets	3,065	22,978
Depreciation and amortization	11,740	46,180
Foreign deferred tax liabilities	1,015	953
Intangible assets		1,167
Deferred subpart F income	14,752	10,054
Gross deferred tax liabilities	27,507	58,354
Net deferred tax liability	$ 24,442	$ 35,376