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Discontinued Operations - income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Discontinued Operation, Income Statement Disclosures [Abstract] |  |
Revenues | $ 0 | $ 893
Cost of revenues | 0 | (534)
Operating and other expenses | 0 | (673)
Gain on disposal of discontinued operations | 0 | 1,227
Income (loss) from discontinued operations before income taxes | 0 | 913
Income tax (benefit) expense | 0 | (873)
Income (loss) from discontinued operations | $ 0 | $ 1,786

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