Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2012

Summary of Authorized and Issued Shares

Our authorized and issued shares (share amounts stated in whole numbers) consist of the following:

			June 30,		December 31,		June 30,
	Par Value		2012		2011		2011
Preferred Stock	$	.01/share
Shares authorized				5,000,000		5,000,000		5,000,000
Shares issued				0		0		0
Common Stock	$	.01/share
Shares authorized				400,000,000		400,000,000		400,000,000
Shares issued				296,150,999		295,258,674		295,099,324

Schedule of Dividends Paid and Declared

The following table presents the dividends paid previously and declared by our board of directors for future payment by quarter:

	2012		2011
First quarter	$	0.17		0.25
Second quarter	$	0.17		0.13
Third quarter	$	0.19		0.13
Fourth quarter	$			0.14
Total	$	0.53		0.65

Summary of Stock Options Granted

The following tables summarize the details of grants made under our stock option plan of options that have been granted and are outstanding, and the assumptions used to value these options. All options granted were effective at the close of business on the date of grant.

			Option		Closing
			exercise		stock price		June 30, 2012
	Options		(strike)		on date		Options		Options
Date of grant	granted		price		of grant		outstanding		vested
April 17, 2012		1,235,000	$	54.00	$	49.01		1,207,500		0
April 19, 2011		410,000	$	35.00	$	31.78		400,000		0
April 20, 2010		530,000	$	30.00	$	27.13		380,000		0
April 21, 2009		790,000	$	27.00	$	17.61		590,000		0
April 15, 2008		550,000	$	27.00	$	24.35		322,450		147,450
April 17, 2007		4,380,000	$	22.50	$	20.15		2,491,725		1,420,725
Total		7,895,000						5,391,675		1,568,175

Summary of Fair Value Assumptions for Options Granted

Date of grant	Risk-free interest rate			Expected life of option in years		Expected dividend yield			Expected stock volatility			Estimated fair value of stock option
April 17, 2012		0.9	%		5.00		1.4	%		39.25	%	$	13.69
April 19, 2011		2.1	%		5.00		1.6	%		39.33	%	$	11.20
April 20, 2010		2.6	%		5.00		1.5	%		39.10	%	$	8.14
April 21, 2009		1.9	%		5.00		1.0	%		38.80	%	$	3.64
April 15, 2008		2.7	%		5.00		1.0	%		30.93	%	$	7.75
April 17, 2007		4.6	%		4.85		1.0	%		31.59	%	$	5.63

Reconciliation of Denominators used in Computation of Basic and Diluted Earnings Per Share

The following tables present a reconciliation of the denominators used in the computation of basic and diluted earnings per share and a summary of the options to purchase shares of common stock which were excluded from the diluted earnings calculation because they were anti-dilutive:

	Six-month period				Three-month period
Reconciliation	2012		2011		2012		2011
Basic-weighted average shares outstanding		295,826,501		294,917,946		296,110,167		294,973,572
Weighted shares assumed upon exercise of stock options		1,194,737		771,717		1,019,731		942,044
Diluted-weighted average shares outstanding		297,021,238		295,689,663		297,129,898		295,915,616

Summary of Anti-Dilutive Options Excluded

	Six-month period				Three-month period
Summary of anti-dilutive options excluded	2012		2011		2012		2011
Options to purchase shares of common stock		501,566		588,785		1,353,132		740,879
Weighted-average exercise price of options	$	54.00	$	31.37	$	49.09	$	32.17