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Common Stock (Table)

12 Months Ended

Dec. 31, 2011

Common Stock [Abstract]

Summary of stock options


		Years Ended December 31,
		2011								2010								2009
		Number of Shares				Average Exercise Price				Number of Shares				Average Exercise Price				Number of Shares				Average Exercise Price
Shares under option at beginning of year			11,039,544			$	38.01				10,255,982			$	34.19				7,547,822			$	37.24
Granted			2,277,946				79.68				3,485,283				44.03				3,234,400				26.03
Cancelled			(241,174	)			40.20				(232,488	)			40.53				(156,356	)			29.79
Exercised			(2,594,566	)			36.84				(2,469,233	)			30.35				(369,884	)			40.86

Shares under option at end of year			10,481,750			$	47.20				11,039,544			$	38.01				10,255,982			$	34.19

Exercisable at end of year			5,073,965			$	38.47				5,067,186			$	36.31				5,308,465			$	33.14

Summary of stock option outstanding information


Range of Exercise Price		Weighted-Avg Remaining Contractual Life				Options Outstanding								Options Exercisable
						Shares				Weighted-Avg Exercise Price				Shares				Weighted-Avg Exercise Price
						Shares				Weighted-Avg Exercise Price				Shares				Weighted-Avg Exercise Price
$ 8.38 - $40.00			5.45				4,121,224			$	27.17				3,124,581			$	27.53
$ 40.01 - $65.00			7.48				4,104,562				49.50				1,919,040				55.72
$ 65.01 - $79.80			9.11				2,255,964				79.60				30,344				73.53

Total			7.03				10,481,750			$	47.20				5,073,965			$	38.47

Assumption used in determination of fair value of share based payment awards


		Years Ended December 31,
		2011				2010				2009
Valuation Assumptions:
Expected volatility			53.2	%			55.0	%			63.5	%
Risk-free interest rate			2.1	%			2.3	%			1.8	%
Expected dividends		$	0.44			$	0.40			$	—
Expected term (in years)			3.1				3.2				3.4

Summary of Information and changes in stock options with regard to stock option plans


		Shares				Weighted- Average Exercise Price				Remaining Contractual Term (years)				Aggregate Intrinsic Value
Outstanding at December 31, 2010			11,039,544			$	38.01
Granted			2,277,946			$	79.68
Exercised			(2,594,566	)		$	36.84
Cancelled			(241,174	)		$	40.20

Outstanding at December 31, 2011			10,481,750			$	47.20				7.03			$	217,950,989

Vested or expected to vest			10,298,319			$	47.20				7.03			$	214,136,846

Exercisable at December 31, 2011			5,073,965			$	38.47				5.61			$	149,787,693

Summary of information regarding outstanding restricted shares


Restricted Shares		Units				Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2008			1,460,496			$	47.34
Granted			762,692			$	26.02
Vested			(7,322	)		$	36.05
Forfeited			(34,622	)		$	41.52

Nonvested at December 31, 2009			2,181,244			$	40.51
Granted			558,531			$	43.99
Vested			(921,454	)		$	43.28
Forfeited			(52,484	)		$	35.11

Nonvested at December 31, 2010			1,765,837			$	42.15
Granted			374,425			$	79.53
Vested			(496,642	)		$	64.22
Forfeited			(37,573	)		$	44.02

Nonvested at December 31, 2011			1,606,047			$	44.21

Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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