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Significant Accounting Policies - Impact of Adoption on Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Tuition receivable, net | $ 41,004 | $ 51,523
Deferred income tax liabilities | 40,107 | 47,942
Retained earnings | $ 192,072 | 152,819
Cumulative Effect, Period of Adoption, Adjusted Balance |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Tuition receivable, net |  | 46,952
Deferred income tax liabilities |  | 46,681
Retained earnings |  | 149,509
Cumulative Effect Period of Adoption Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Tuition receivable, net |  | (4,571)
Deferred income tax liabilities |  | (1,261)
Retained earnings |  | $ (3,310)

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