Equity Compensation Plans and Equity (Tables)

12 Months Ended

Dec. 31, 2012

Equity Compensation Plans and Equity

Assumptions based on which fair value of each option granted was estimated using the Black-Scholes option-pricing model

	For the year ended December 31,
	2012			2011			2010
Weighted-average expected stock-price volatility		59	%		55	%		62	%
Weighted-average expected option life		5 years			4 years			5 years
Average risk-free interest rate		0.70	%		1.40	%		1.92	%
Average dividend yield		0	%		0	%		0	%

Summary of restricted stock awards and restricted stock unit activity

	Shares (000's)			Weighted- Average Grant-Date Fair Value
Nonvested as of December 31, 2011		618		$	33.61
Granted		324			32.62
Vested		(167	)		20.60
Forfeited (including cancelled awards)		(82	)		34.98
Nonvested as of December 31, 2012		693		$	36.11

Summary of stock option awards activity

	Shares (000's)			Weighted- Average Exercise Price		Aggregate Intrinsic Value (000's)		Weighted- Average Remaining Contractual Life (in years)
Outstanding as of December 31, 2011		2,106		$	25.58
Granted		704			32.55
Exercised		(351	)		15.39
Forfeited (including cancelled options)		(137	)		35.88
Outstanding as of December 31, 2012		2,322		$	28.63	$	13,149		6.4
Options exercisable as of December 31, 2012		1,282		$	22.63	$	12,948		4.5

Summary of information about stock options outstanding

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number Outstanding at December 31, 2012 (000s)		Weighted-Average Remaining Contractual Life (in years)		Weighted- Average Exercise Price		Number Exercisable at December 31, 2012 (000s)		Weighted- Average Exercise Price
$8.82 - 16.37		522		3.4	$	11.05		522	$	11.05
17.48 - 26.69		352		2.9		19.66		320		19.16
28.60 - 42.96		1,155		8.4		33.64		339		35.29
44.09 - 51.70		293		8.4		50.91		101		50.79
		2,322		6.4	$	28.63		1,282	$	22.63