Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Stockholders' Equity [Abstract]

Authorized And Issued Shares

	Par Value		2011		2010
Preferred Stock	$	.01/share
Authorized				5,000,000		5,000,000
Shares issued				0		0
Common Stock	$	.01/share
Authorized				400,000,000		400,000,000
Shares issued				295,258,674		294,861,424

Stock Options Granted

	Shares granted		Option exercise (strike) price		Closing stock price on date of grant		December 31, 2011
Date of grant							Options outstanding		Options vested
April 19, 2011		410,000	$	35.00	$	31.78		410,000		0
April 20, 2010		530,000	$	30.00	$	27.13		400,000		0
April 21, 2009		790,000	$	27.00	$	17.61		600,000		0
April 15, 2008		550,000	$	27.00	$	24.35		350,000		0
April 17, 2007		4,380,000	$	22.50	$	20.15		3,372,750		1,852,750

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

Summary Of Stock Option Plan Activity

	Options outstanding			Exercise Price1		Remaining Life2
Outstanding as of January 1, 2011		5,320,000		$	24.03		5.50
Granted		410,000		$	35.00		7.93
Exercised/earned		(397,250	)	$	22.50
Cancelled/forfeited		(200,000	)	$	26.78
Outstanding as of December 31, 2011		5,132,750		$	24.92		4.72
Exercisable as of December 31, 2011		1,852,750		$	22.50		3.16

¹  Weighted-average exercise price

²  Weighted-average remaining contractual life in years

	Options outstanding			Exercise Price1		Remaining Life2
Outstanding as of January 1, 2010		5,120,000		$	23.54		6.28
Granted		530,000		$	30.00		8.41
Exercised/earned		0			0
Cancelled/forfeited		(330,000	)	$	26.00
Outstanding as of December 31, 2010		5,320,000		$	24.03		5.50
Exercisable as of December 31, 2010		638,000		$	22.50		2.57

¹ Weighted-average exercise price

² Weighted-average remaining contractual life in years

Status Of Nonvested Shares Under Stock Option Plan

Nonvested shares	Shares			Weighted average grant- date fair value
Outstanding as of January 1, 2011		4,682,000		$	5.85
Granted		410,000			11.20
Vested		(1,612,000	)		5.69
Forfeited		(200,000	)		6.77
Outstanding as of December 31, 2011		3,280,000		$	6.54

Nonvested shares	Shares			Weighted average grant- date fair value
Outstanding as of January 1, 2010		4,700,000		$	5.55
Granted		530,000			8.14
Vested		(218,000	)		5.16
Forfeited		(330,000	)		5.77
Outstanding as of December 31, 2010		4,682,000		$	5.85

Reconciliation Of Denominators Used In The Computation Of Basic And Diluted Earnings Per Share

Reconciliation	2011		2010		2009
Basic-weighted average shares outstanding		295,053,790		294,861,424		296,715,970
Weighted shares assumed upon exercise of stock options		814,936		0		0
Diluted-weighted average shares outstanding		295,868,726		294,861,424		296,715,970

Summary Of Anti-Dilutive Options Excluded

		000,000,000		000,000,000		000,000,000
Summary of anti-dilutive options excluded	2011		2010		2009
Options to purchase shares of common stock		704,384		5,328,246		5,255,120
Weighted-average exercise prices of options	$	32.05		23.94		23.57