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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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