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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of revenue |  |  |
Revenues | $ 634,185 | $ 454,851 | $ 441,088
Strayer University |  |  |
Disaggregation of revenue |  |  |
Revenues | 471,104 | 449,547 | 435,153
Strayer University | Tuition, net of discounts, grants and scholarships |  |  |
Disaggregation of revenue |  |  |
Revenues | 451,646 | 433,938 | 418,220
Strayer University | Other Revenue |  |  |
Disaggregation of revenue |  |  |
Revenues | 19,458 | 15,609 | 16,933
Capella University |  |  |
Disaggregation of revenue |  |  |
Revenues | $ 154,918 |  |
Subscription period for FlexPath courses | 84 days |  |
Capella University | Tuition, net of discounts, grants and scholarships |  |  |
Disaggregation of revenue |  |  |
Revenues | $ 147,138 |  |
Capella University | Other Revenue |  |  |
Disaggregation of revenue |  |  |
Revenues | 7,780 |  |
Non-Degree Programs |  |  |
Disaggregation of revenue |  |  |
Revenues | $ 8,163 | $ 5,304 | $ 5,935

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