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Stock-Based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2012

Summary of Stock Options Issued Pursuant to Stock Incentive Plans

A summary of 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, 2011		3,490,056		$	23.28
Granted		74,984			39.54
Exercised		(703,911	)		19.61
Forfeited		(35,956	)		22.82
Expired		(4,000	)		10.19

Outstanding as of June 30, 2012		2,821,173		$	24.65		5.22	$	55,190,215

Exercisable as of June 30, 2012		1,742,982		$	24.13		4.54	$	34,994,228

Estimated Fair Value of Options Granted using Black-Scholes Option-Pricing Model with Weighted-Average Assumptions

The fair value of options granted during the three and six months ended June 30, 2012 was estimated on the date of grant using the Black-Scholes option-pricing model, a pricing model acceptable under U.S. GAAP, with the following weighted-average assumptions:


	Three Months Ended			Six Months Ended			Three Months Ended			Six Months Ended
	June 30, 2012			June 30, 2012			June 30, 2011			June 30, 2011
Expected life (years)		10.00			9.11			5.50			5.50
Interest rate		1.6	%		1.5	%		1.6	%		1.6	%
Volatility		53.4	%		53.0	%		50.8	%		50.8	%
Dividend yield		—			—			—			—

Summary of Nonvested Long-Term Incentive Program Performance Share Awards Outstanding and Changes During Period

A summary of nonvested long-term incentive program performance share awards (“LTIP performance shares”) outstanding as of June 30, 2012 and changes during the period are as follows:


Nonvested LTIP Performance Shares	Number of Shares at Expected Attainment			Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2011		931,571		$	23.33
Granted		11,987			39.25
Forfeited		(21,878	)		26.04

Nonvested as of June 30, 2012		921,680		$	23.47

Summary of Nonvested Restricted Share Awards and Changes During Period

A summary of nonvested restricted share awards (“RSAs”) as of June 30, 2012 and changes during the period are as follows:


Nonvested Restricted Share Awards	Number of Restricted Share Awards			Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2011		100,023		$	19.29
Granted		3,500			38.72
Vested		(40,183	)		16.78
Forfeited		(7,250	)		16.52

Nonvested as of June 30, 2012		56,090		$	22.66

Stock Incentive Plan 2003

Summary of Nonvested Restricted Share Awards and Changes During Period

A summary of nonvested Transaction RSAs issued under the S1 2003 Stock Incentive Plan as of June 30, 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		(75,478	)		35.41
Forfeited		(15,540	)		35.41

Nonvested as of June 30, 2012		79,187		$	35.41