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Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2011

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

Weighted-average assumptions used to estimate the grant date fair values for stock options granted in the nine month periods ended September 30, 2011 and 2010 follow:

		Nine Months Ended September 30,
		2011				2010
Volatility			45.97	%			45.98	%
Expected term (in years)			5.00				5.00
Dividend yield			0.67	%			1.35	%
Risk-free interest rate			2.34	%			2.47	%

Stock Option Activity

Stock option activity from January 1, 2011 to September 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			(838,307	)		$	16.75
Outstanding at September 30, 2011			7,291,295			$	20.52
Exercisable at September 30, 2011			6,112,320			$	20.63

Restricted Stock Activity

Restricted stock activity from January 1, 2011 to September 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			(538,508	)		$	17.85
Forfeited			(44,858	)		$	21.57
Non-vested restricted stock outstanding at September 30, 2011			1,297,985			$	23.78

Restricted Stock Unit Activity

Restricted stock unit activity from January 1, 2011 to September 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 September 30, 2011			17,501			$	23.47

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

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