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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions | A summary of stock options issued under the various Stock Incentive Plans previously described and changes is as follows:
|  | Number of Shares |  |  | Weighted- Average Exercise Price ($) |  |  | Weighted- Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value of In-the-Money Options ($) |
Outstanding, December 31, 2013 |  |  | 7,408,821 |  |  | $ | 11.02 |  |  |  |  |  |  |  |  |
Granted |  |  | 27,132 |  |  |  | 20.13 |  |  |  |  |  |  |  |  |
Exercised |  |  | (2,036,558 | ) |  |  | 8.08 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (116,702 | ) |  |  | 17.80 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2014 |  |  | 5,282,693 |  |  |  | 12.06 |  |  |  |  |  |  |  |  |
Granted |  |  | 2,055,514 |  |  |  | 19.12 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,144,273 | ) |  |  | 10.62 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (394,265 | ) |  |  | 19.06 |  |  |  |  |  |  |  |  |
Expired |  |  | (593 | ) |  |  | 20.51 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2015 |  |  | 5,799,076 |  |  |  | 14.37 |  |  |  |  |  |  |  |  |
Granted |  |  | 2,284,500 |  |  |  | 17.92 |  |  |  |  |  |  |  |  |
Exercised |  |  | (792,841 | ) |  |  | 11.69 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (446,845 | ) |  |  | 18.69 |  |  |  |  |  |  |  |  |
Expired |  |  | (52,515 | ) |  |  | 20.44 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2016 |  |  | 6,791,375 |  |  | $ | 15.54 |  |  |  | 6.68 |  |  | $ | 20,777,320 |
Exercisable, December 31, 2016 |  |  | 3,650,356 |  |  | $ | 13.15 |  |  |  | 4.87 |  |  | $ | 20,245,847 |
Summary of Nonvested Restricted Share Awards and Changes During Period | A summary of nonvested RSAs are as follows:
Nonvested Restricted Share Awards |  | Restricted Share Awards |  |  | Grant Date Fair Value |
Nonvested at December 31, 2013 |  |  | 145,065 |  |  | $ | 14.91 |
Granted |  |  | 106,275 |  |  |  | 18.57 |
Vested |  |  | (66,670 | ) |  |  | 14.59 |
Forfeited |  |  | (1,461 | ) |  |  | 20.51 |
Nonvested at December 31, 2014 |  |  | 183,209 |  |  |  | 17.11 |
Granted |  |  | 125,026 |  |  |  | 23.82 |
Vested |  |  | (158,973 | ) |  |  | 17.21 |
Nonvested at December 31, 2015 |  |  | 149,262 |  |  |  | 22.62 |
Granted |  |  | 148,322 |  |  |  | 20.19 |
Vested |  |  | (114,219 | ) |  |  | 22.64 |
Forfeited |  |  | (11,257 | ) |  |  | 21.01 |
Nonvested at December 31, 2016 |  |  | 172,108 |  |  | $ | 20.62 |
Online Resources Corporation |
Summary of Transaction Stock Options Issued Pursuant to Stock Incentive Plans | A summary of transaction stock options issued pursuant to the Company’s stock incentive plans is as follows:
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value of In-the-Money Options |
Outstanding as of December 31, 2013 |  |  | 62,445 |  |  | $ | 35.03 |  |  |  |  |  |  |  |  |
Exercised |  |  | (909 | ) |  |  | 13.92 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (15,024 | ) |  |  | 31.03 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2014 |  |  | 46,512 |  |  |  | 36.73 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,926 | ) |  |  | 13.92 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (23,550 | ) |  |  | 44.83 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2015 |  |  | 21,036 |  |  |  | 29.76 |  |  |  |  |  |  |  |  |
Exercised |  |  | (4,299 | ) |  |  | 13.92 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (2,634 | ) |  |  | 40.51 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2016 |  |  | 14,103 |  |  | $ | 32.58 |  |  |  | 1.39 |  |  | $ | — |
Exercisable as of December 31, 2016 |  |  | 14,103 |  |  | $ | 32.58 |  |  |  | 1.39 |  |  | $ | — |
S1 Corporation 2003 Stock Incentive Plan [Member] |
Summary of Nonvested Restricted Share Awards and Changes During Period | A summary of nonvested Retention RSAs as of December 31, 2016 and changes during the period are as follows:
Nonvested Retention Restricted Share Awards |  | Number of Retention Restricted Share Awards |  |  | Weighted-Average Grant Date Fair Value |
Nonvested as of December 31, 2015 |  |  | — |  |  | $ | — |
Granted |  |  | 473,069 |  |  |  | 17.89 |
Vested |  |  | (226,526 | ) |  |  | 17.89 |
Forfeited |  |  | (41,003 | ) |  |  | 17.89 |
Nonvested as of December 31, 2016 |  |  | 205,540 |  |  | $ | 17.89 |
Black-Scholes Option-Pricing Model [Member] |
Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions | The fair value of options granted in the respective fiscal years are estimated on the date of grant using the Black-Scholes option-pricing model, acceptable under ASC 718, with the following weighted-average assumptions:
|  | Years Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Expected life (years) |  |  | 5.9 |  |  |  | 5.9 |  |  |  | 5.9 |
Risk-free interest rate |  |  | 1.2 | % |  |  | 1.4 | % |  |  | 1.8 | %
Expected volatility |  |  | 29.7 | % |  |  | 32.1 | % |  |  | 45.2 | %
Expected dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Monte Carlo Simulation [Member] |
Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions | With respect to options granted that vest based on the achievement of certain market conditions, the grant date fair value of such options was estimated using the following weighted-average assumptions:
|  | Years Ended December 31, |
|  | 2016 |  |  | 2015 |
Expected life (years) |  |  | 7.5 |  |  |  | 7.5 |
Risk-free interest rate |  |  | 1.6 | % |  |  | 1.7 | %
Expected volatility |  |  | 41.6 | % |  |  | 41.9 | %
Expected dividend yield |  |  | — |  |  |  | — |
LTIP Performance Shares [Member] |
Summary of Nonvested Performance-Based Share Awards and Changes During Period | A summary of the nonvested LTIP Performance Shares is as follows:
Nonvested LTIP Performance Shares |  | Number of Shares at Expected Attainment |  |  | Weighted- Average Grant Date Fair Value |
Nonvested at December 31, 2013 |  |  | 2,718,576 |  |  | $ | 13.78 |
Granted |  |  | 19,065 |  |  |  | 20.13 |
Vested |  |  | (635,643 | ) |  |  | 8.88 |
Forfeited |  |  | (111,599 | ) |  |  | 16.43 |
Change in expected attainment for 2012 and 2013 grants |  |  | (844,483 | ) |  |  | 15.86 |
Nonvested at December 31, 2014 |  |  | 1,145,916 |  |  |  | 14.84 |
Granted |  |  | 1,025,863 |  |  |  | 19.12 |
Vested |  |  | (548,671 | ) |  |  | 9.75 |
Forfeited |  |  | (205,510 | ) |  |  | 19.39 |
Change in expected attainment for 2011 and 2013 grants |  |  | (528,303 | ) |  |  | 19.44 |
Nonvested at December 31, 2015 |  |  | 889,295 |  |  |  | 19.13 |
Granted |  |  | 1,059,428 |  |  |  | 17.92 |
Forfeited |  |  | (210,667 | ) |  |  | 18.61 |
Nonvested at December 31, 2016 |  |  | 1,738,056 |  |  | $ | 18.45 |
Performance-Based Restricted Share Awards [Member] |
Summary of Nonvested Performance-Based Share Awards and Changes During Period | A summary of nonvested PBRSAs as of December 31, 2016 and changes during the period are as follows:
Nonvested Performance-Based Restricted Share Awards |  | Number of Performance-Based Restricted Share Awards |  |  | Weighted-Average Grant Date Fair Value |
Nonvested as of December 31, 2014 |  |  | — |  |  | $ | — |
Granted |  |  | 978,365 |  |  |  | 23.45 |
Forfeited |  |  | (39,502 | ) |  |  | 24.24 |
Nonvested as of December 31, 2015 |  |  | 938,863 |  |  |  | 23.42 |
Forfeited |  |  | (67,397 | ) |  |  | 22.34 |
Vested |  |  | (169,567 | ) |  |  | 24.41 |
Change in attainment for 2015 grants |  |  | (18,232 | ) |  |  | 24.41 |
Nonvested as of December 31, 2016 |  |  | 683,667 |  |  | $ | 23.25 |
Restricted share awards (RSAs) [Member] | PAY.ON |
Summary of Nonvested Restricted Share Awards and Changes During Period | A summary of nonvested PAY.ON RSAs as of December 31, 2016 and changes during the period are as follows:
Nonvested PAY.ON RSAs |  | Number of PAY.ON RSAs |  |  | Grant Date Fair Value |
Nonvested at December 31, 2014 |  |  | — |  |  | $ | — |
Granted |  |  | 476,750 |  |  |  | 23.60 |
Nonvested at December 31, 2015 |  |  | 476,750 |  |  |  | 23.60 |
Vested |  |  | (238,374 | ) |  |  | 23.60 |
Nonvested at December 31, 2016 |  |  | 238,376 |  |  | $ | 23.60 |

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