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Stock Options, Restricted Stock and Restricted Stock Units (Tables) | 3 Months Ended
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Mar. 31, 2018
Stock Options, Restricted Stock and Restricted Stock Units [Abstract] |
Schedule of restricted stock and restricted stock units activity |
|  | Number of shares or units |  | Weighted- average Grant price |
Balance, December 31, 2017 |  | 716,128 |  | $ | 99.65 |
Grants |  | 144,577 |  |  | 90.99 |
Vested shares |  | (140,852) |  |  | 58.99 |
Forfeitures |  | (11,331) |  |  | 57.37 |
Balance, March 31, 2018 |  | 708,522 |  | $ | 107.51 |
Schedule of stock option activity and other stock option information |
|  |  |  |  |  | Weighted- |  |  |
|  |  |  |  |  | average |  |  |
|  |  |  | Weighted- |  | remaining |  | Aggregate |
|  | Number of |  | average |  | contractual |  | intrinsic value(1) |
|  | shares |  | exercise price |  | life (years) |  | (in thousands) |
Balance, December 31, 2017 |  | 100,000 |  | $ | 51.95 |  | 3.1 |  | $ | 3,763 |
Grants |  | — |  |  | — |  |  |  |  |  |
Exercises |  | — |  |  | — |  |  |  |  |  |
Forfeitures/Expirations |  | — |  |  | — |  |  |  |  |  |
Balance, March 31, 2018 |  | 100,000 |  | $ | 51.95 |  | 2.8 |  | $ | 4,910 |
Exercisable, March 31, 2018 |  | 100,000 |  | $ | 51.95 |  | 2.8 |  | $ | 4,910 |
| (1) |  | The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between the Company’s closing stock price on the respective trading day and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holder had all options been exercised on the respective trading day. The amount of intrinsic value will change based on the fair market value of the Company’s common stock.
Schedule of stock-based compensation expense |
|  | For the three months ended |
|  | March 31, |
|  | 2017 |  | 2018 |
Instruction and educational support |  | $ | 170 |  | $ | 620 |
Marketing |  |  | — |  |  | — |
Admissions advisory |  |  | — |  |  | — |
General and administration |  |  | 2,257 |  |  | 2,068 |
Stock-based compensation expense included in operating expense |  |  | 2,427 |  |  | 2,688 |
Tax benefit |  |  | 958 |  |  | 752 |
Stock-based compensation expense, net of tax |  | $ | 1,469 |  | $ | 1,936 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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