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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	$ 15,532	$ 11,627	$ 10,767
Tax benefit	3,922	4,593	4,256
Stock-based compensation expense, net of income tax	11,610	7,034	6,511
Instruction and educational support
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	2,572	1,943	1,432
Marketing
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	585
Admissions advisory
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	16
General and administration
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	10,117	$ 9,684	$ 9,335
Merger costs
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	$ 2,242

X

- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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