Common Stock (Tables)

12 Months Ended

Dec. 31, 2013

Information Related to Stock Repurchase Programs

The following schedule provides information related to our stock repurchase programs for each of the three years ended December 31, 2013. All of the shares repurchased during 2013 and 2012 related to income tax withholding obligations resulting from the exercise of stock options and the vesting of restricted stock grants. No shares were repurchased during 2013 or 2012 pursuant to our publicly announced stock repurchase program.

	Total number of shares purchased as part of publicly announced programs		Total price paid for shares purchased as part of publicly announced programs (in thousands)		Total number of shares purchased related to stock-based compensation plans (a.)		Total price paid for shares purchased related to stock-based compensation plans (in thousands)		Aggregate number of shares purchased		Aggregate price paid for shares purchased (in thousands)		Maximum number of shares that may yet be purchased under the publicly announced program
Balance as of January 1, 2011														2,152,339
2011		1,384,637	$	50,576		217,649	$	9,906		1,602,286	$	60,482		767,702
2012		—		—		433,312	$	19,154		433,312	$	19,154		767,702
2013		—		—		427,170	$	27,201		427,170	$	27,201		767,702
Total for three year period ended December 31, 2013		1,384,637	$	50,576		1,078,131	$	56,261		2,462,768	$	106,837

(a.) During 2013, there were 427,170 shares repurchased at an average price of $63.68 per share related to income tax withholding obligations in connection with stock-based compensation programs. During 2012, there were 432,562 shares repurchased at an average price of $44.28 per share related to income tax withholding obligations in connection with stock-based compensation programs, and 750 shares repurchased at an average of $.01 per share related to restricted shares that were forfeited by former employees pursuant to the terms of our restricted stock purchase plan. During 2011, there were 217,649 shares repurchased at an average price of $45.51 per share related to income tax withholding obligations in connection with stock-based compensation programs.

Weighted-Average Assumptions Fair Value of Option Grants

The weighted-average assumptions reflected below were each based upon eighteen option grants.

Year Ended December 31,	2013			2012			2011
Volatility		36	%		33	%		29	%
Interest rate		1	%		1	%		2	%
Expected life (years)		3.6			3.5			3.5
Forfeiture rate		11	%		10	%		9	%
Dividend yield		0.5	%		0.6	%		0.7	%

Stock Option Activity

The table below summarizes our stock option activity during each of the last three years:

Outstanding Options	Number of Shares			Average Option Price		Range (High-Low)
Balance, January 1, 2011		6,594,950		$	25.16	$	32.28 -$16.22
Granted		2,894,500		$	43.66	$	54.79 -$38.12
Exercised		(1,563,255	)	$	26.38	$	32.28 -$16.22
Cancelled		(367,250	)	$	32.60	$	46.97 -$16.22
Balance, January 1, 2012		7,558,945		$	31.63	$	54.79 -$16.22
Granted		2,966,850		$	37.01	$	44.83 -$36.95
Exercised		(2,608,007	)	$	23.22	$	46.97 -$16.22
Cancelled		(481,550	)	$	38.00	$	46.97 -$16.22
Balance, January 1, 2013		7,436,238		$	36.31	$	54.79 -$16.22
Granted		2,889,750		$	53.51	$	79.79 -$53.38
Exercised		(2,288,666	)	$	32.27	$	54.79 -$16.22
Cancelled		(416,364	)	$	43.93	$	53.38 -$16.22
Balance, December 31, 2013		7,620,958		$	43.63	$	79.79 -$30.32
Outstanding options vested and exercisable as of December 31, 2013		1,756,128		$	35.60	$	46.97 -$30.32

Information about Unvested Options

The following table provides information about unvested options for the year December 31, 2013:

	Shares			Weighted Average Grant Date Fair Value
Unvested options as of January 1, 2013		5,250,926		$	10.74
Granted		2,889,750		$	13.33
Vested		(1,864,982	)	$	10.22
Cancelled		(410,864	)	$	11.66
Unvested options as of December 31, 2013		5,864,830		$	12.12

Information about all Outstanding Options and Exercisable Options

The following table provides information about all outstanding options, and exercisable options, at December 31, 2013:

	Options Outstanding		Options Exercisable
Number		7,620,958		1,756,128
Weighted average exercise price	$	43.64	$	35.60
Aggregate intrinsic value as of December 31, 2013	$	286,740,433	$	80,189,277
Weighted average remaining contractual life		2.9		1.6

Weighted Average Remaining Contractual Life for Options Outstanding and Weighted Average Exercise Price Per Share for Exercisable Options

The weighted average remaining contractual life for options outstanding and weighted average exercise price per share for exercisable options at December 31, 2013 were as follows:

	Options Outstanding		Exercisable Options		Expected to Vest Options (a)
Exercise Price	Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life (in Years)		Shares		Weighted Average Exercise Price Per Share		Shares		Weighted Average Exercise Price Per Share
$30.32 – $36.95		3,183,583	$	35.14		2.4		1,259,453	$	32.45		1,716,901	$	36.91
$38.12 – $43.67		1,685,350		43.56		2.1		496,175		43.58		1,061,101		43.55
$44.83 – $53.38		2,724,525		53.36		4.0		500		46.97		2,430,648		53.36
$54.79 – $79.79		27,500		67.64		4.0		0		N/A		24,538		67.64
Total		7,620,958	$	43.63		2.9		1,756,128	$	35.60		5,233,188	$	46.04

(a) Assumes a weighted average forfeiture rate of 10.8%.