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Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2003
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash included in other current assets	$ 14,011	$ 304
Restricted cash included in other assets	500	500			$ 500
Cash and cash equivalents	187,509	419,693
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	202,020	420,497	$ 312,237	$ 156,448
Strayer or Capella University
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash included in other current assets	123	$ 304
Australia/New Zealand
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash included in other current assets	$ 13,900

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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