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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Activity Related to Restricted Stock Granted under Incentive Plan | A summary of the activity related to restricted stock granted under the University’s Incentive Plan is as follows:
|  | Total Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Outstanding as of December 31, 2014 |  |  | 1,033 |  |  | $ | 28.75 |
Granted |  |  | 324 |  |  | $ | 45.66 |
Vested |  |  | (274 | ) |  | $ | 27.18 |
Forfeited, canceled or expired |  |  | (27 | ) |  | $ | 30.27 |
Outstanding as of December 31, 2015 |  |  | 1,056 |  |  | $ | 34.30 |
Granted |  |  | 275 |  |  | $ | 44.46 |
Vested |  |  | (329 | ) |  | $ | 30.56 |
Forfeited, canceled or expired |  |  | (9 | ) |  | $ | 37.94 |
Outstanding as of December 31, 2016 |  |  | 993 |  |  | $ | 38.32 |
Granted |  |  | 192 |  |  | $ | 70.44 |
Vested |  |  | (375 | ) |  | $ | 32.46 |
Forfeited, canceled or expired |  |  | (34 | ) |  | $ | 44.51 |
Outstanding as of December 31, 2017 |  |  | 776 |  |  | $ | 49.16
Summary of Activity Related to Stock Options Granted under University's Incentive Plan | A summary of the activity related to stock options granted under the University’s Incentive Plan is as follows:
|  | Summary of Stock Options Outstanding |
|  | Total Shares |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value ($)(1) |
Outstanding as of December 31, 2014 |  |  | 2,452 |  |  | $ | 14.83 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (218 | ) |  | $ | 15.97 |  |  |  |  |  |  |  |  |
Forfeited, canceled or expired |  |  | (14 | ) |  | $ | 16.08 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2015 |  |  | 2,220 |  |  | $ | 14.71 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (946 | ) |  | $ | 13.97 |  |  |  |  |  |  |  |  |
Forfeited, canceled or expired |  |  | (2 | ) |  | $ | 19.23 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2016 |  |  | 1,272 |  |  | $ | 15.26 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (576 | ) |  | $ | 12.79 |  |  |  |  |  |  |  |  |
Forfeited, canceled or expired |  |  | (2 | ) |  | $ | 16.35 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2017 |  |  | 694 |  |  | $ | 17.31 |  |  |  | 2.71 |  |  | $ | 50,114 |
Exercisable as of December 31, 2017 |  |  | 694 |  |  | $ | 17.31 |  |  |  | 2.71 |  |  | $ | 50,114 |
(1) | Aggregate intrinsic value represents the value of the University’s closing stock price on December 29, 2017 ($89.53) in excess of the exercise price multiplied by the number of options outstanding or exercisable.
Share-Based Compensation Expense | The table below outlines share-based compensation expense for the fiscal years ended December 31, 2017, 2016 and 2015 related to restricted stock and stock options granted:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Instructional costs and services |  | $ | 7,874 |  |  | $ | 7,398 |  |  | $ | 6,779 |
Admissions advisory and related |  |  | 198 |  |  |  | 232 |  |  |  | 192 |
Marketing and promotional |  |  | 169 |  |  |  | 125 |  |  |  | 130 |
General and administrative |  |  | 4,447 |  |  |  | 4,521 |  |  |  | 4,156 |
Share-based compensation expense included in operating expenses |  |  | 12,688 |  |  |  | 12,276 |  |  |  | 11,257 |
Tax effect of share-based compensation |  |  | (5,075 | ) |  |  | (4,910 | ) |  |  | (4,503 | )
Share-based compensation expense, net of tax |  | $ | 7,613 |  |  | $ | 7,366 |  |  | $ | 6,754 |

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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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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