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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Stock Options Issued Pursuant to Stock Incentive Plans | 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, 2009 |  |  | 3,556,873 |  |  | $ | 20.72 |  |  |  |  |  |  |  |  |
Granted |  |  | 338,950 |  |  |  | 24.48 |  |  |  |  |  |  |  |  |
Exercised |  |  | (235,986 | ) |  |  | 13.34 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (106,625 | ) |  |  | 18.11 |  |  |  |  |  |  |  |  |
Expired |  |  | (42,674 | ) |  |  | 30.31 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2010 |  |  | 3,510,538 |  |  |  | 21.55 |  |  |  |  |  |  |  |  |
Granted |  |  | 367,202 |  |  |  | 28.95 |  |  |  |  |  |  |  |  |
Exercised |  |  | (361,093 | ) |  |  | 12.40 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (26,591 | ) |  |  | 20.53 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2011 |  |  | 3,490,056 |  |  |  | 23.28 |  |  |  |  |  |  |  |  |
Granted |  |  | 435,367 |  |  |  | 42.43 |  |  |  |  |  |  |  |  |
Exercised |  |  | (847,301 | ) |  |  | 19.74 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (105,540 | ) |  |  | 22.19 |  |  |  |  |  |  |  |  |
Expired |  |  | (4,000 | ) |  |  | 10.19 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2012 |  |  | 2,968,582 |  |  | $ | 27.15 |  |  |  | 5.28 |  |  | $ | 49,151,503 |
Exercisable, December 31, 2012 |  |  | 1,840,304 |  |  | $ | 24.44 |  |  |  | 4.49 |  |  | $ | 35,426,182 |
Estimated Fair Value of Options Granted using Black-Scholes Option-Pricing Model with Weighted-Average Assumptions | The fair value of options granted in the respective fiscal years was estimated on the date of grant using the Black-Scholes option-pricing model, a pricing model acceptable under ASC 718, with the following weighted-average assumptions:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Expected life (years) |  |  | 6.2 |  |  |  | 5.9 |  |  |  | 5.9 |
Risk-free interest rate |  |  | 0.8 | % |  |  | 1.4 | % |  |  | 2.3 | %
Expected volatility |  |  | 51.4 | % |  |  | 50.6 | % |  |  | 50.8 | %
Expected dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Summary of Nonvested Long-Term Incentive Program Performance Share Awards Outstanding 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, 2009 |  |  | 216,150 |  |  | $ | 16.52 |
Granted |  |  | 207,180 |  |  |  | 26.29 |
Forfeited or expired |  |  | (25,620 | ) |  |  | 16.52 |
Change in expected attainment for 2009 grants |  |  | 101,325 |  |  |  | 16.52 |
Nonvested at December 31, 2010 |  |  | 499,035 |  |  |  | 20.57 |
Granted |  |  | 237,751 |  |  |  | 28.94 |
Forfeited or expired |  |  | (36,682 | ) |  |  | 18.92 |
Change in expected attainment for 2009 and 2010 grants |  |  | 231,468 |  |  |  | 22.71 |
Nonvested at December 31, 2011 |  |  | 931,571 |  |  |  | 23.33 |
Granted |  |  | 273,595 |  |  |  | 42.65 |
Forfeited or expired |  |  | (103,682 | ) |  |  | 23.12 |
Nonvested at December 31, 2012 |  |  | 1,101,484 |  |  | $ | 28.14 |
Restricted share awards (RSAs) |
Summary of Nonvested Restricted Share Awards | A summary of nonvested RSAs are as follows:
Nonvested Restricted Share Awards |  | Restricted Share Awards |  |  | Grant Date Fair Value |
Nonvested at December 31, 2009 |  |  | 314,548 |  |  | $ | 17.94 |
Granted |  |  | 25,950 |  |  |  | 22.19 |
Vested |  |  | (95,014 | ) |  |  | 17.81 |
Forfeited or expired |  |  | (53,186 | ) |  |  | 18.52 |
Nonvested at December 31, 2010 |  |  | 192,298 |  |  |  | 18.42 |
Granted |  |  | 6,300 |  |  |  | 28.95 |
Vested |  |  | (86,325 | ) |  |  | 18.31 |
Forfeited or expired |  |  | (12,250 | ) |  |  | 17.52 |
Nonvested at December 31, 2011 |  |  | 100,023 |  |  |  | 19.29 |
Granted |  |  | 56,389 |  |  |  | 44.81 |
Vested |  |  | (79,299 | ) |  |  | 18.72 |
Forfeited or expired |  |  | (7,875 | ) |  |  | 16.78 |
Nonvested at December 31, 2012 |  |  | 69,238 |  |  | $ | 41.02 |
S1 2003 Stock Incentive Plan |
Summary of Nonvested Restricted Share Awards | A summary of nonvested Transaction RSAs issued under the S1 2003 Stock Incentive Plan as of December 31, 2012 and changes during the period are as follows:
Nonvested Transaction Restricted Share Awards |  | Number of Restricted Share Awards |  |  | Weighted-Average Grant Date Fair Value |
Nonvested as of December 31, 2011 |  |  | — |  |  | $ | — |
Transaction RSAs converted upon acquisition of S1 |  |  | 170,205 |  |  |  | 35.41 |
Vested |  |  | (100,685 | ) |  |  | 35.41 |
Forfeited |  |  | (19,276 | ) |  |  | 35.41 |
Nonvested as of December 31, 2012 |  |  | 50,244 |  |  | $ | 35.41 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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