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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	$ 2,499	$ 5,844	$ 9,075	$ 11,781
Tax benefit	651	1,607	2,333	3,253
Stock-based compensation expense, net of tax	1,848	4,237	6,742	8,528
Instructional and support costs
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	945	703	2,820	1,821
General and administration
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	2,077	2,869	5,888	7,688
Merger and integration costs
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	$ (523)	$ 2,272	$ 367	$ 2,272

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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