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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of weighted average assumptions used for options granted | The following weighted average assumptions were used for options granted:
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Expected life (in years) | 5.0 |  | 5.0 |  | 6.0
Expected volatility | 26.1 | % |  | 27.0 | % |  | 26.6 | %
Risk-free interest rate | 1.0 | % |  | 0.4 | % |  | 1.8 | %
Expected forfeiture rate | — | % |  | — | % |  | — | %
Summarizes restricted stock unit and performance share activity | The following table summarizes restricted stock unit and performance stock unit activity during the periods presented (shares in thousands):
|  | Number of Shares |  | Weighted Average Grant Date Fair Value per Share
Unvested at December 31, 2020 |  | 587 |  |  | 282.45 |
Granted |  | 197 |  |  | 458.79 |
Conversion of Unvested Restricted Stock Awards |  | 44 |  |  | 451.99 |
Vested |  | (205) |  |  | 276.93 |
Forfeited |  | (23) |  |  | 330.75 |
Unvested at December 31, 2021 |  | 600 |  |  | $ | 355.43 |
Summary of stock option activity | Options granted, exercised, forfeited and expired are summarized as follows:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2020 | 2,177 |  |  | 181.63 |  |  |  |  |
Granted | 87 |  |  | 451.94 |  |  |  |  |
Exercised | (627) |  |  | 154.26 |  |  |  |  |
Forfeited | (17) |  |  | 202.55 |  |  |  |  |
Outstanding at December 31, 2021 | 1,620 |  |  | $ | 206.06 |  |  | 6 |  | $ | 537,547 |
Exercisable at December 31, 2021 | 1,178 |  |  | $ | 173.51 |  |  | 5 |  | $ | 429,336 |
Other information pertaining to option activity was as follows during the twelve months ended December 31:
| 2021 |  | 2020 |  | 2019
Weighted average grant-date fair value of stock options granted | $ | 113.18 |  |  | $ | 98.69 |  |  | $ | 74.54 |
Total intrinsic value of stock options exercised | $ | 215,062 |  |  | $ | 292,394 |  |  | $ | 155,899 |
Summary of share-based compensation expense related to share-based awards | The following table summarizes share-based compensation expense related to share-based awards which is recorded in the consolidated statements of comprehensive income:
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Cost of subscriptions, software services and maintenance | $ | 23,705 |  |  | $ | 18,125 |  |  | $ | 15,002 |
Selling, general and administrative expenses | 81,021 |  |  | 49,240 |  |  | 44,965 |
Total share-based compensation expenses | 104,726 |  |  | 67,365 |  |  | 59,967 |
Excess tax benefit | (47,675) |  |  | (60,190) |  |  | (29,819) |
Net decrease in net income | $ | 57,051 |  |  | $ | 7,175 |  |  | $ | 30,148 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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