Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Equity-Based Compensation [Abstract]

Shares Of Time-Vested Restricted Stock Granted And Vesting Schedules Of Restricted Stock Awards

Vesting period	Number of shares granted
At grant	5,905
After three years of service	209,605

Weighted-Average Assumptions Used For Grants Of Stock Options And SARs

	2011	2010	2009
Expected dividend yield	0%	0%	0%
Forfeiture rate	11.50%	9.78%	9.92%
Volatility	35.33%	39.50%	43.08%
Risk free interest rate	2.01%	2.26%	2.23%
- Range of interest rates	0.01% - 3.18%	0.06% - 3.41%	0.15% - 3.29%
Expected weighted-average life	5.42 years	5.36 years	5.23 years
Fair value of options and SARs granted	$5,495,000	$6,527,000	$6,046,000
Weighted-average grant date fair value of options and SARs granted     (per underlying share)	$14.29	$10.64	$8.06

Summary Of Stock Option And SAR Activity

	2011					2010					2009
Options and SARs	Shares			Weighted- Average Exercise Price		Shares			Weighted- Average Exercise Price		Shares			Weighted- Average Exercise Price
Outstanding at beginning of year		3,575,746			$ 32.68		3,451,945			$ 32.81		3,139,174			$ 35.83
Granted		387,847			41.13		612,681			27.82		749,951			19.96
Exercised		(586,387	)		25.91		(304,565	)		23.03		(128,311	)		17.53
Forfeited		(302,679	)		26.39		(93,476	)		30.44		(132,646	)		37.28
Expired		(84,153	)		40.69		(90,839	)		38.02		(176,223	)		39.88
Outstanding at end of year		2,990,374			$ 35.47		3,575,746			$ 32.68		3,451,945			$ 32.81
Exercisable at end of year		1,894,324			$ 38.00		2,042,664			$ 36.24		1,884,449			$ 35.23
Intrinsic value of exercised options and SARs		$ 8,100,000					$ 2,567,000					$ 738,000

Summary Of Outstanding And Exercisable Option And SARs

	Outstanding						Exercisable
Range of Exercise Prices	Number of Shares		Weighted-Average Remaining Contractual Life		Weighted- Average Exercise Price		Number of Shares		Weighted- Average Exercise Price
$ 1.29-$25.23		603,176		5.95 years	$	20.31		347,741	$	20.67
$ 25.24-$35.75		567,476		8.00 years		28.93		149,295		30.41
$ 35.76-$41.25		684,979		5.73 years		38.41		595,291		38.66
$ 41.26-$45.62		753,244		6.32 years		43.16		420,498		44.42
$ 45.63-$53.92		381,499		2.91 years		48.70		381,499		48.70
		2,990,374						1,894,324

	Outstanding	Exercisable
Aggregate intrinsic value	$    15,751,000	$    7,272,000
Weighted-average remaining contractual term	6.0 years	4.7 years

Summary Of Restricted Stock Award Activity

	2011					2010					2009
Restricted Stock Awards and Performance Share Awards	Shares			Weighted-Average Grant Date Fair Value		Shares			Weighted-Average Grant Date Fair Value		Shares			Weighted-Average Grant Date Fair Value
Outstanding at beginning of year		844,686			$ 25.47		507,984			$ 23.94		283,567			$ 30.35
Granted		215,510			41.25		375,279			27.84		298,703			20.02
Released		(204,681	)		30.03		(22,325	)		29.11		(35,904	)		32.97
Forfeited		(19,374	)		29.08		(16,252	)		26.19		(38,382	)		32.34
Outstanding at end of year		836,141			$ 28.34		844,686			$ 25.47		507,984			$ 23.94

Weighted-Average Assumptions Used For Employee Purchase Rights Granted Under Stock Purchase Plan

	2011		2010		2009
Fair market value	$	34.77	$	27.95	$	21.41
Option price	$	33.03	$	26.55	$	19.66
Expected dividend yield		0%		0%		0%
Expected volatility		33%		25%		34%
Risk free interest rate		0.07%		0.14%		0.18%