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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Tax expense at statutory rate	$ 1,211	$ 6,444	$ 1,995
Nondeductible transaction costs	1,676	908
State income taxes, net of federal benefit	212	531	499
Nondeductible loss on unit disposals		455
Nondeductible entertainment expenses	258	221	184
Foreign income taxes	364	130	118
Limitation of future deductibility of stock awards	145
Provision to return adjustments	96	29	122
State valuation allowance adjustment	54	(84)	(19)
Impact of Tax Cuts and Job Act	(255)
Equity compensation	(2,664)	135	144
Net change in uncertain tax positions	(67)	(153)	(869)
Federal tax rate differential	(100)
Foreign tax credit	(133)	(178)	(92)
Unrealized income on investments	(163)	(111)	63
Domestic production activities deduction	(174)	(456)	(87)
Research and development credit	(525)	(296)	(281)
Other	(78)	59	86
Income tax (benefit) expense	$ (143)	$ 7,634	$ 1,863

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