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Business Combinations - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Aug. 01, 2018	Dec. 31, 2017
Fair value of assets and liabilities
Goodwill	$ 732,075	$ 732,540		$ 20,744
Capella Merger
Fair value of assets and liabilities
Cash and cash equivalents			$ 167,859
Marketable securities			31,419
Tuition receivable			36,716
Income tax receivable			163
Other current assets			9,041
Marketable securities, non-current			34,700
Property and equipment, net			53,182
Other assets			14,556
Intangible assets			349,800
Goodwill			725,275
Total assets acquired			1,422,711
Accounts payable and accrued expenses			(48,103)
Contract liabilities			(39,000)
Deferred income taxes			(96,320)
Other long-term liabilities			(2,327)
Total liabilities assumed			(185,750)
Total consideration			$ 1,236,961

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Amount of assets including goodwill acquired at the acquisition date.

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Amount of investments in debt securities available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of contract with customer liability due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of income tax receivable recognized as of the acquisition date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. 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.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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