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Stock Options, Restricted Stock and Restricted Stock Units (Tables) | 12 Months Ended
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Dec. 31, 2017
Stock Options, Restricted Stock and Restricted Stock Units [Abstract] |
Schedule of restricted stock and restricted stock units activity |
|  | Number of shares or unit |  | Weighted- average Grant price |
Balance, December 31, 2014 |  | 524,216 |  | $ | 115.67 |
Grants |  | 126,655 |  |  | 61.00 |
Vested shares |  | (13,725) |  |  | 52.94 |
Forfeitures |  | (2,819) |  |  | 115.55 |
Balance, December 31, 2015 |  | 634,327 |  | $ | 104.66 |
Grants |  | 188,737 |  |  | 50.63 |
Vested shares |  | (23,539) |  |  | 50.43 |
Forfeitures |  | (72,425) |  |  | 62.41 |
Balance, December 31, 2016 |  | 727,100 |  | $ | 97.53 |
Grants |  | 75,140 |  |  | 82.18 |
Vested shares |  | (84,908) |  |  | 66.60 |
Forfeitures |  | (1,204) |  |  | 62.28 |
Balance, December 31, 2017 |  | 716,128 |  | $ | 99.65 |
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, 2014 |  | 100,000 |  | $ | 51.95 |  | 6.0 |  | $ | 2,233 |
Grants |  | — |  |  | — |  |  |  |  |  |
Exercises |  | — |  |  | — |  |  |  |  |  |
Forfeitures |  | — |  |  | — |  |  |  |  |  |
Balance, December 31, 2015 |  | 100,000 |  | $ | 51.95 |  | 5.1 |  | $ | 817 |
Grants |  | — |  |  | — |  |  |  |  |  |
Exercises |  | — |  |  | — |  |  |  |  |  |
Forfeitures |  | — |  |  | — |  |  |  |  |  |
Balance, December 31, 2016 |  | 100,000 |  | $ | 51.95 |  | 4.1 |  | $ | 2,868 |
Grants |  | — |  |  | — |  |  |  |  |  |
Exercises |  | — |  |  | — |  |  |  |  |  |
Forfeitures/Expirations |  | — |  |  | — |  |  |  |  |  |
Balance, December 31, 2017 |  | 100,000 |  | $ | 51.95 |  | 3.1 |  | $ | 3,763 |
Exercisable, December 31, 2017 |  | 100,000 |  | $ | 51.95 |  | 3.1 |  | $ | 3,763 |
| (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.
Summary of number of shares exercisable | The number of shares exercisable as of December 31, 2015, 2016, and 2017 are as follows:
|  | Number of |  | Weighted-average |
|  | Shares |  | exercise price |
Exercisable, December 31, 2015 |  | 100,000 |  | $ | 51.95 |
Exercisable, December 31, 2016 |  | 100,000 |  | $ | 51.95 |
Exercisable, December 31, 2017 |  | 100,000 |  | $ | 51.95 |
Schedule of stock-based compensation expense | The following table sets forth the amount of stock-based compensation expense recorded in each of the expense line items for the years ended December 31, 2015, 2016, and 2017 (in thousands):
|  | 2015 |  | 2016 |  | 2017 |
Instruction and educational support |  | $ | 2,134 |  | $ | 1,432 |  | $ | 1,943 |
Marketing |  |  | — |  |  | — |  |  | — |
Admissions advisory |  |  | — |  |  | — |  |  | — |
General and administration |  |  | 8,079 |  |  | 9,335 |  |  | 9,684 |
Stock-based compensation expense included in operating expense |  |  | 10,213 |  |  | 10,767 |  |  | 11,627 |
Tax benefit |  |  | 4,032 |  |  | 4,256 |  |  | 4,593 |
Stock-based compensation expense, net of tax |  | $ | 6,181 |  | $ | 6,511 |  | $ | 7,034 |
Schedule of information regarding share-based payment arrangements | The following table summarizes information regarding share-based payment arrangements for the years ended December 31, 2015, 2016, and 2017 (in thousands):
|  | 2015 |  | 2016 |  | 2017 |
Proceeds from stock options exercised |  | $ | — |  | $ | — |  | $ | — |
Tax (shortfall) windfall related to share-based payment arrangements |  | $ | (24) |  | $ | (51) |  | $ | 562 |
Intrinsic value of stock options exercised |  | $ | — |  | $ | — |  | $ | — |

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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 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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