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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ 3,566 | $ 3,250 | $ 6,576 | $ 5,937
Tax benefit | 923 | 894 | 1,682 | 1,646
Stock-based compensation expense, net of tax | 2,643 | 2,356 | 4,894 | 4,291
Instructional and support costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 1,017 | 499 | 1,875 | 1,118
General and administration |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 2,138 | 2,751 | 3,811 | 4,819
Merger and integration costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ 411 | $ 0 | $ 890 | $ 0

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- 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. + References No definition available. + Details
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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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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