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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	$ 3,859	$ 3,566	$ 6,884	$ 6,576
Tax benefit	993	923	1,770	1,682
Stock-based compensation expense, net of tax	2,866	2,643	5,114	4,894
Instructional and support costs
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	1,356	1,017	2,386	1,875
General and administration
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	2,503	2,138	4,498	3,811
Merger and integration costs
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	$ 0	$ 411	$ 0	$ 890

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Amount, after tax, of expense for award under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 718
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Amount of noncash expense for share-based payment arrangement.

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