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Significant Accounting Policies - Components of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Product Information [Line Items] |  |  |
Concentration risk | 100.00% | 100.00% | 100.00%
Revenue | $ 3,385,876 | $ 3,301,864 | $ 3,399,774
Tuition and educational services |  |  |
Product Information [Line Items] |  |  |
Concentration risk | 114.00% | 110.00% | 107.00%
Revenue | $ 3,874,402 | $ 3,648,244 | $ 3,650,138
Student fees |  |  |
Product Information [Line Items] |  |  |
Concentration risk | 3.00% | 2.00% | 2.00%
Revenue | $ 88,108 | $ 77,860 | $ 83,805
Dormitory / residency |  |  |
Product Information [Line Items] |  |  |
Concentration risk | 0.00% | 1.00% | 2.00%
Revenue | $ 6,118 | $ 42,555 | $ 62,006
Other |  |  |
Product Information [Line Items] |  |  |
Concentration risk | 5.00% | 5.00% | 5.00%
Revenue | $ 170,344 | $ 154,699 | $ 168,230
Gross revenue |  |  |
Product Information [Line Items] |  |  |
Concentration risk | 122.00% | 118.00% | 116.00%
Revenue | $ 4,138,972 | $ 3,923,358 | $ 3,964,179
Less: Discounts / waivers / scholarships |  |  |
Product Information [Line Items] |  |  |
Concentration risk | 22.00% | 18.00% | 16.00%
Revenue | $ 753,096 | $ 621,494 | $ 564,405

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