Fair Value Disclosures (Tables)

3 Months Ended

Mar. 31, 2012

Cash, Cash Equivalents And Investments, As Well As The Hierarchy For Financial Instruments Measured At Fair Value On A Recurring Basis


			Fair value measurements using:
	Fair Value		Level 1		Level 2		Level 3
March 31, 2012:
Cash equivalents:
U.S. Treasury bills (1)	$	49,994	$	49,994
Money market funds	$	45,396	$	45,396		—		—
Short-term investments:
U.S. Treasury bills	$	199,939	$	199,939		—		—
December 31, 2011:
Cash equivalents:
Money market funds	$	44,044	$	44,044		—		—
Short-term investments:
U.S. Treasury bills	$	74,996	$	74,996		—		—

(1)	Includes a $50.0 million U.S. Treasury bill maturing within ninety days of March 31, 2012 and classified as a cash equivalent on the consolidated balance sheet.

Fair Value Of Other Financial Instruments Not Measured On A Recurring Basis


			Fair value measurements using:
	Fair Value		Level 1		Level 2		Level 3
March 31, 2012:
Assets:
Bank deposits (included in "Cash and cash equivalents")	$	84,757	$	84,757		—		—
Liabilities:
Convertible Notes	$	272,658			$	272,658
December 31, 2011:
Assets:
Bank deposits (included in "Cash and cash equivalents")	$	26,092	$	26,092		—		—

- Definition

Tabular disclosure of assets and liabilities by class, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). The disclosures that may be required or desired include: (a) the fair value measurements recorded during the period and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

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- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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