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Discontinued Operations - income (loss) (Details) - USD ($) $ 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 | Dec. 31, 2018 | Dec. 31, 2017
Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 893 | $ 24,475
Cost of revenues |  |  |  |  |  |  |  |  | (534) | (16,048)
Operating and other expenses |  |  |  |  |  |  |  |  | (674) | (7,893)
Gain on disposal of discontinued operations |  |  |  |  |  |  |  |  | 1,251 | 0
Income (loss) from discontinued operations before income taxes |  |  |  |  |  |  |  |  | 936 | 534
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (441) | (617)
Income (loss) from discontinued operations | $ (443) | $ 0 | $ 34 | $ 1,786 | $ 1,010 | $ 228 | $ 236 | $ (323) | $ 1,377 | $ 1,151

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