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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Tax expense at statutory rate	$ (1,340)	$ 1,211	$ 6,444
Valuation allowance change	719	54	(84)
Nondeductible entertainment expenses	206	258	221
Nondeductible executive compensation	320	145
Equity compensation	(2,081)	(2,664)	135
Research and development credit	(557)	(525)	(296)
Unrealized income on investments	(337)	(163)	(111)
Foreign income taxes	(250)	364	130
Impact of Tax Cuts and Job Act	(238)	(255)
Net change in uncertain tax positions	(154)	(67)	(153)
State income taxes, net of federal benefit	(8)	212	531
Nondeductible transaction costs		1,676	908
Nondeductible loss on unit disposals			455
Federal tax rate differential		(100)
Foreign tax credit		(133)	(178)
Domestic production activities deduction		(174)	(456)
Other	169	18	88
Income tax (benefit) expense	$ (3,551)	$ (143)	$ 7,634

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