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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Weighted Average Assumptions Used for Options Granted | The following weighted average assumptions were used for options granted:
| Years Ended December 31,
| 2016 |  | 2015 |  | 2014
Expected life (in years) | 6.0 |  |  | 6.0 |  |  | 6.0 |
Expected volatility | 29.3 | % |  | 28.3 | % |  | 30.9 | %
Risk-free interest rate | 1.8 | % |  | 1.7 | % |  | 1.8 | %
Expected forfeiture rate | — | % |  | 1.7 | % |  | 3.0 | %
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 statements of comprehensive income:
| Years Ended December 31,
| 2016 |  | 2015 |  | 2014
Cost of software services, maintenance and subscriptions | $ | 6,548 |  |  | $ | 3,380 |  |  | $ | 2,177 |
Selling, general and administrative expenses | 23,199 |  |  | 16,802 |  |  | 12,642 |
Total share-based compensation expenses | 29,747 |  |  | 20,182 |  |  | 14,819 |
Tax benefit | (30,059 | ) |  | (5,986 | ) |  | (4,237 | )
Net (decrease) increase in net income | $ | (312 | ) |  | $ | 14,196 |  |  | $ | 10,582 |
Stock Option Activity | Other information pertaining to option activity was as follows during the twelve months ended December 31:
| 2016 |  | 2015 |  | 2014
Weighted average grant-date fair value of stock options granted | $ | 46.89 |  |  | $ | 45.17 |  |  | $ | 31.32 |
Total intrinsic value of stock options exercised | 103,703 |  |  | 149,542 |  |  | 69,768 |
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, 2013 | 5,720 |  |  | $ | 34.66 |  |  |  |  |  |
Granted | 675 |  |  | 94.15 |  |  |  |  |  |
Exercised | (855 | ) |  | 17.17 |  |  |  |  |  |
Forfeited | (3 | ) |  | 37.44 |  |  |  |  |  |
Outstanding at December 31, 2014 | 5,537 |  |  | 44.61 |  |  |  |  |  |
Granted | 747 |  |  | 145.71 |  |  |  |  |  |
Exercised | (1,118 | ) |  | 20.71 |  |  |  |  |  |
Forfeited | (2 | ) |  | 19.61 |  |  |  |  |  |
Outstanding at December 31, 2015 | 5,164 |  |  | 64.43 |  |  |  |  |
Granted | 846 |  |  | 147.25 |  |  |  |  |
Exercised | (827 | ) |  | 28.43 |  |  |  |  |  |
Forfeited | (27 | ) |  | 95.33 |  |  |  |  |  |
Outstanding at December 31, 2016 | 5,156 |  |  | 83.64 |  |  | 7 |  | $ | 320,924 |
Exercisable at December 31, 2016 | 2,311 |  |  | 58.07 |  |  | 6 |  | $ | 198,460 |

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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=6415400&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=6415400&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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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