Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Schedule Of Option Activity And Changes

	Options			Weighted Average Exercise Price		Weighted Average Remaining Term (Years)		Aggregate Intrinsic Value
Outstanding at December 31, 2010		1,314,524		$	20.81
Granted		99,380			45.83
Exercised		(274,872	)		19.44
Cancelled		(5,885	)		34.41
Outstanding at December 31, 2011		1,133,147		$	23.26		6.5	$	19,788
Exercisable at December 31, 2011		503,830		$	18.74		5.8	$	10,835

Schedule Of Range Of Exercise Prices For Outstanding Options

Range of Prices	Options Outstanding		Weighted Average Remaining Contractual Life (Years)
$14.24 – $19.29		505,268		6.2
$20.53 – $27.24		258,767		7.5
$30.07 – $45.83		369,112		6.2

Schedule Of Weighted Average Value And Assumptions For Fair Value Of Options

	Stock Option Grants
	Year Ended December 31,
	2011		2010		2009
Weighted average fair value	$	19.22	$	8.31	$	5.67
Risk-free interest rate		2.8%		2.9%		2.8%
Expected life in years		6		6		6 – 7
Expected volatility		41.9%		41.8%		42.5%
Expected dividend yield		0.5%		1.1%		1.5%

Schedule Of Non-Vested Restricted Stock Award Activity And Changes

	Number of Shares			Weighted Average Grant Date Fair Value
Non-vested at December 31, 2010		654,241		$	19.97
Granted		78,828			45.03
Vested		(143,121	)		19.64
Forfeited		(7,935	)		20.48
Non-vested at December 31, 2011		582,013		$	23.43