Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2013

Summary of Dividends Declared

The Executive Committee, acting on behalf of the Board of Directors, declared the following dividends during the periods presented:

Declaration Date	Dividend Per Share		Record Date		Total Amount (in thousands)		Payment Date
February 5, 2013	$	0.13		March 11, 2013	$	17,983		March 28, 2013
February 9, 2012	$	0.09		March 12, 2012	$	12,204		March 30, 2012

Weighted Average Assumptions of Black-Scholes Option-Pricing Model

The fair value of the stock options granted during the three months ended March 31, 2013 was estimated at the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:

Risk-free interest rate		0.70	%
Expected volatility		44.96	%
Expected life (in years)		4.08
Dividend yield		0.79	%
Weighted-average estimated fair value of options granted	$	22.19