Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurements [Abstract]

Schedule Of Financial Assets And Financial Liabilities Measured At Fair Value

				Fair Value Measurements at Reporting Date Using
Description	Carrying Amount in Condensed Consolidated Balance Sheets			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
As of March 31, 2012
Assets:
Cash equivalents	$	1,043,632		$	1,043,632	$	—		$	—
Short-term investments		1,198,289			1,198,289		—			—
Commodity contracts		1,790			—		1,790			—
Restricted cash and investments		586,190			586,190		—			—
Total assets	$	2,829,901		$	2,828,111	$	1,790		$	—
Liabilities:
Foreign exchange contracts	$	(113	)	$	—	$	(113	)	$	—
As of December 31, 2011
Assets:
Cash equivalents	$	1,012,122		$	1,012,122	$	—		$	—
Short-term investments		1,362,641			1,362,641		—			—
Commodity contracts		5,071			—		5,071			—
Restricted cash and investments		585,833			585,833		—			—
Total assets	$	2,965,667		$	2,960,596	$	5,071		$	—
Liabilities:
Foreign exchange and commodity contracts	$	(21,434	)	$	—	$	(21,434	)	$	—