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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Schedule Of Assets And Liabilities Carried At Fair Value Measured On A Recurring Basis

The following tables provide the assets and liabilities carried at fair value measured on a recurring basis as of June 30, 2013 and December 31, 2012 (in thousands):



	Assets at Fair Value as of June 30, 2013
Asset Category	Level 1				Level 2			Level 3			Total
Cash and cash equivalents ⁽¹⁾	$	530,385			—			—			$	530,385
Restricted cash ⁽²⁾	8,182				—			—			8,182
Short-term investments ⁽²⁾	—				—			—			—
Total	$	538,567			—			—			$	538,567



	Assets at Fair Value as of December 31, 2012
Asset Category	Level 1				Level 2			Level 3			Total
Cash and cash equivalents ⁽¹⁾	$	605,303			—			—			$	605,303
Restricted cash ⁽²⁾	6,281				—			—			6,281
Short-term investments ⁽²⁾	4,879				—			—			4,879
Total	$	616,463			—			—			$	616,463

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(1)	Cash and cash equivalents consist primarily of money market funds with original maturity dates of three months or less, which are Level 1 assets. At June 30, 2013 and December 31, 2012, we had $146.9 million and $407.4 million, respectively, in money market funds.


(2)	Restricted cash and short-term investments with original maturities greater than three months are classified as “Prepaid expenses and other” on our Condensed Consolidated Balance Sheets.