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Acquisitions and Dispositions (Details 1) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | [1] | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net operating revenue |  |  |  |  |  |  |  |  | $ 129,228 | $ 128,180
Station operating expense |  |  |  |  |  |  |  |  | 97,314 | 96,218
Corporate general and administrative |  |  |  |  |  |  |  |  | 11,359 | 11,657
Other operating expenses |  |  |  |  |  |  |  |  | 61 | 55
Impairment of intangible assets |  |  |  |  |  |  |  |  | 0 | 1,449
Operating income |  |  |  |  |  |  |  |  | 20,494 | 18,801
Interest expense |  |  |  |  |  |  |  |  | 946 | 903
Interest income |  |  |  |  |  |  |  |  | (631) | 0
Other income |  |  |  |  |  |  |  |  | (23) | 0
Income from continuing operations before income tax expense | $ 5,965 | $ 5,270 | $ 5,966 | $ 2,189 | $ 3,659 | $ 5,255 | $ 5,647 | $ 1,765 | 20,202 | 17,898
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 5,944 | (5,276)
Income from continuing operations, net of tax |  |  |  |  |  |  |  |  | 14,258 | 23,174
Income from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0 | 32,471
Net income |  |  |  |  |  |  |  |  | $ 14,258 | $ 55,645
Basic earnings per share: |  |  |  |  |  |  |  |  |  |
From continuing operations |  |  |  |  |  |  |  |  | $ 2.40 | $ 3.93
From discontinued operations |  |  |  |  |  |  |  |  | 0 | 5.50
Basic earnings per share |  |  |  |  |  |  |  |  | 2.40 | 9.43
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |
From continuing operations |  |  |  |  |  |  |  |  | 2.40 | 3.93
From discontinued operations |  |  |  |  |  |  |  |  | 0 | 5.50
Diluted earnings per share |  |  |  |  |  |  |  |  | $ 2.40 | $ 9.43
[1] | March 31, 2017 quarterly data have been reclassified to conform with current presentation.

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