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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Schedule of assets measured at fair value on a recurring basis

	Fair Value Measurements as of December 31, 2011

	Total		Level 1		Level 2		Level 3
Marketable Securities
Bonds	$	492,517	$	—	$	492,517	$	—
Commercial paper		4,557		—		4,557		—
Asset backed securities		478		—		478		—

		497,552		—		497,552		—
Cash, Cash Equivalents and Restricted Cash		148,960		148,960		—		—
Other Assets(a)		3,793		—		—		3,793

Total Assets Measured at Fair Value	$	650,305	$	148,960	$	497,552	$	3,793

	Fair Value Measurements as of December 31, 2010

	Total		Level 1		Level 2		Level 3
Marketable Securities
Bonds	$	665,023	$	—	$	665,023	$	—
Commercial paper		4,998		—		4,998		—
Asset backed securities		718		—		718		—

		670,739		—		670,739		—
Cash, Cash Equivalents and Restricted Cash		134,113		134,113		—		—
Other Assets(a)		4,002		—		—		4,002

Total Assets Measured at Fair Value	$	808,854	$	134,113	$	670,739	$	4,002

(a): Auction rate securities included in "Other assets" in the Consolidated Balance Sheet

Schedule of fair value measurements using significant unobservable inputs

	Auction Rate Securities

Balance at January 1, 2011	$	4,002
Total realized and unrealized gains or (losses)
Included in earnings		—
Included in other comprehensive income		(209	)
Transferred out		—
Settlements		—

Balance at December 31, 2011	$	3,793

- 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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- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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