Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Summary Of Individual Plans

	Plan Year
	1998		2000		2001		2004		2007		Total
Reserved		4,500,000		3,000,000		9,750,000		6,000,000		6,000,000		29,250,000
Outstanding		90,000		69,750		1,154,500		3,145,481		1,844,001		6,303,732
Available for grant		0		0		0		154,307		1,880,599		2,034,906

Summary Of Information About Stock Options Outstanding

	Stock Options Outstanding						Stock Options Exercisable
Range of Exercise Prices	Number		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price		Number		Weighted Average Exercise Price
$19.79 – $20.38		1,351,500		5.89 years	$	20.38		903,500	$	20.38
$20.38 – $21.33		1,152,330		0.56 years		21.17		1,152,330		21.17
$21.33 – $26.02		1,306,202		2.90 years		25.84		1,306,202		25.84
$26.02 – $28.22		2,493,700		1.65 years		28.22		2,493,700		28.22
$19.79 – $28.22		6,303,732		2.62 years	$	24.76		5,855,732	$	25.09

Schedule Of Specific Weighted Average Valuation Assumptions

Expected dividend yield	0.00	%
Risk-free interest rate	2.41	%
Expected volatility	32.72	%
Expected term	6 years

Summary Of Stock Option Activity

	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding at December 31, 2008		12,486,397		$	23.12		2.74	$	1,526,570
Exercised in 2009		(2,903,000	)		18.89
Cancelled, forfeited or expired in 2009		(2,940,521	)		22.50
Options granted in 2009		1,344,000			20.38
Outstanding at December 31, 2009		7,986,876			24.43		4.23	$	14,398,197
Exercised in 2010		(1,069,537	)		23.88
Cancelled, forfeited or expired in 2010		(5,325	)		27.25
Options granted in 2010		0			0.00
Outstanding at December 31, 2010		6,912,014			24.51		3.41	$	19,658,512
Exercised in 2011		(596,682	)		21.84
Cancelled, forfeited or expired in 2011		(11,600	)		27.69
Options granted in 2011		0			0.00
Outstanding at December 31, 2011		6,303,732		$	24.76		2.62	$	12,469,431
Exercisable at December 31, 2011		5,855,732		$	25.09		2.37	$	10,081,591
Vested or expected to vest as of December 31, 2011		6,302,970		$	24.76		2.62	$	12,465,371

Summary Of Restricted Stock Activity

	Shares			Weighted-Average Grant Date Fair Value Per Share
Unvested at December 31, 2008		1,367,775		$	22.48
Granted		1,713,000			20.37
Vested		(548,250	)		20.11
Forfeited		(25,950	)		25.07
Unvested at December 31, 2009		2,506,575			21.53
Granted		582,400			23.76
Vested		(381,025	)		22.92
Forfeited		(23,700	)		24.67
Unvested at December 31, 2010		2,684,250			21.79
Granted		272,000			23.40
Vested		(384,125	)		23.54
Forfeited		(29,136	)		24.19
Unvested at December 31, 2011		2,542,989		$	21.67

Schedule Of Weighted-Average Fair Value Per Share

	Year Ended December 31,
	2011		2010		2009
Options granted		N/A		N/A	$	7.15
Restricted stock awards granted	$	23.40	$	23.76	$	20.37
ESPP stock purchases	$	5.27	$	5.40	$	3.42