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Summary of Significant Accounting Policies - Acquisition (Details) - USD ($) $ in Thousands	Jan. 22, 2019	Mar. 31, 2021	Dec. 31, 2020
Acquisition
Goodwill		$ 160,766	$ 160,766
Orbis Education
Acquisition
Purchase price	$ 361,184
Intangible assets	210,280
Goodwill	157,825
Orbis Education | University partner relationships
Acquisition
Intangible assets	$ 210,000

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