Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Weighted-Average Assumptions Used To Value Options Granted

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
Expected term of options	5.0 years			7.0 years			6.2 years			7.0 years
Expected volatility		42	%		40	%		41	%		40	%
Risk-free interest rate		1.877	%		2.94	%		2.674	%		2.94	%
Dividend yield	zero			zero			zero			zero

Summary Of Stock Options

						Weighted-
				Weighted-		Average
				Average		Remaining		Aggregate
	Number of			Exercise		Contractual		Intrinsic
	Options			Price		Term (Years)		Value
Outstanding at December 31, 2010		4,825		$	19.18		5.58
Granted		399		$	18.56
Exercised		(130	)	$	11.18
Forfeited or expired		(120	)	$	19.04
Outstanding at June 30, 2011		4,974		$	19.35		5.51	$	5,195
Exercisable at June 30, 2011		3,395		$	20.69		4.33	$	3,146

Restricted Shares [Member]

Summary Of Stock-Based Awards

				Weighted-
				Average
				Grant Date
	Shares			Fair Value
Non-vested shares outstanding at December 31, 2010		178		$	17.17
Granted		195		$	18.57
Vested		(10	)	$	17.54
Forfeited		(14	)	$	17.57
Non-vested shares outstanding at June 30, 2011		349		$	17.92

Restricted Stock Units And Phantom Stock [Member]

Summary Of Stock-Based Awards

				Weighted-
				Average
				Grant Date
	Shares			Fair Value
Non-vested shares outstanding at December 31, 2010		47		$	17.05
Granted		86		$	17.77
Forfeited		(5	)	$	17.61
Non-vested shares outstanding at June 30, 2011		128		$	17.51

Performance Based Restricted Stock Units [Member]

Summary Of Stock-Based Awards

			Weighted-
			Average
			Grant Date
	Shares		Fair Value
Non-vested shares outstanding at December 31, 2010		—		—
Granted(1)		93	$	18.57
Forfeited		—		—
Non-vested shares outstanding at June 30, 2011		93	$	18.57

(1) Represents target number of shares that can vest based on the achievement of certain performance criteria.