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Merger with Capella Education Company - Prom Forma Information (Details) - Capella Merger - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Pro Forma Financial information |  |
Revenue | $ 679,309 | $ 664,523
Net Income | $ 10,606 | $ 32,096

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