Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2012

Stockholders' Equity [Abstract]

Summary Of Authorized And Issued Shares

	Par Value		March 31, 2012		December 31, 2011		March 31, 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				296,071,374		295,258,674		294,861,424

Schedule Of Dividends Paid And Declared

	2012		2011
First quarter	$	0.17		0.25
Second quarter	$	0.17		0.13
Third quarter	$			0.13
Fourth quarter	$			0.14
Total	$	0.34		0.65

Summary Of Stock Options Granted

			Option		Closing
			exercise		stock price		March 31, 2012
	Options		(strike)		on date		Options		Options
Date of grant	granted		price		of grant		outstanding		vested
April 19, 2011		410,000	$	35.00	$	31.78		400,000		0
April 20, 2010		530,000	$	30.00	$	27.13		390,000		0
April 21, 2009		790,000	$	27.00	$	17.61		590,000		0
April 15, 2008		550,000	$	27.00	$	24.35		350,000		0
April 17, 2007		4,380,000	$	22.50	$	20.15		2,555,050		1,040,050

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 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 The Computation Of Basic And Diluted Earnings Per Share

	Three-month period
Reconciliation	2012		2011
Basic-weighted average shares outstanding		295,538,402		294,861,424
Weighted shares assumed upon exercise of stock options		1,388,821		567,518
Diluted-weighted average shares outstanding		296,927,223		295,428,942

Summary Of Anti-Dilutive Options Excluded

	Three-month period
Summary of anti-dilutive options excluded	2012		2011
Options to purchase shares of common stock		0		809,888
Weighted-average exercise price of options	$	0.00	$	28.61