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Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Weighted-Average Assumptions Used to Estimate the Grant Date Fair Values for Stock Options Granted

Treasury yields. Weighted-average assumptions used to estimate the grant date fair values for stock options granted in the three and six month periods ended June 30, 2011 and 2010 follow:

		Three Months Ended June  30,								Six Months Ended June  30,
		2011				2010				2011				2010
Volatility			45.82	%			45.92	%			45.97	%			45.98	%
Expected term (in years)			5.00				5.00				5.00				5.00
Dividend yield			0.64	%			1.35	%			0.67	%			1.35	%
Risk-free interest rate			2.38	%			2.46	%			2.34	%			2.47	%

Stock Option Activity

Stock option activity from January 1, 2011 to June 30, 2011 follows:

		Underlying Shares				Weighted Average Exercise Price
Outstanding at January 1, 2011			7,710,102			$	19.58
Granted			419,500			$	30.28
Exercised			(748,002	)		$	17.39
Outstanding at June 30, 2011			7,381,600			$	20.41
Exercisable at June 30, 2011			6,027,308			$	20.68

Restricted Stock Activity

Restricted stock activity from January 1, 2011 to June 30, 2011 follows:

		Shares				Weighted Average Grant Date Fair Value
Non-vested restricted stock outstanding at January 1, 2011			1,114,051			$	16.05
Granted			767,300			$	30.71
Vested			(492,714	)		$	18.20
Forfeited			(19,282	)		$	19.62
Non-vested restricted stock outstanding at June 30, 2011			1,369,355			$	23.44

Restricted Stock Unit Activity

Restricted stock unit activity from January 1, 2011 to June 30, 2011 follows:

		Shares				Weighted Average Grant Date Fair Value
Non-vested restricted stock units outstanding at January 1, 2011			17,834			$	19.73
Granted			10,000			$	30.63
Vested			(10,333	)		$	23.94
Forfeited			—			$	—
Non-vested restricted stock units outstanding at June 30, 2011			17,501			$	23.47

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- Definition

Tabular disclosure of the changes in outstanding nonvested restricted stock units.

+ References

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-Topic 718
-SubTopic 10
-Publisher FASB
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-Article
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-Name Accounting Standards Codification
-Paragraph 2
-Section 50
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+ References

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