Short-Term Investments (Tables)

12 Months Ended

Dec. 31, 2011

Available-For-Sale Securities Reported At Fair Value


	December 31, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in thousands)
Cash	$	388,941	$	—	$	—		$	388,941
Level 1 securities (1):
Money market funds		123,608		—		—			123,608
Level 2 securities (3):
Corporate debt securities		112,264		603		(214	)		112,653
Government and agency securities		175,464		694		(56	)		176,102
Asset and mortgage-backed securities		941		62		—			1,003

	$	801,218	$	1,359	$	(270	)	$	802,307

Less: Restricted cash (1)									(4,496	)

Total cash, cash equivalents and short-term investments								$	797,811


	December 31, 2010
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in thousands)
Cash	$	194,146	$	—	$	—		$	194,146
Level 1 securities (2):
Money market funds		4,914		—		—			4,914
Level 2 securities (3):
Corporate debt securities		109,745		1,043		(101	)		110,687
Government and agency securities		42,062		331		(101	)		42,292
Asset and mortgage-backed securities		2,881		168		(140	)		2,909

	$	353,748	$	1,542	$	(342	)		354,948

Less: Long-term restricted cash (2)									(4,561	)

Total cash, cash equivalents and short-term investments								$	350,387

(1)	Includes $119.1 million that is included in cash and cash equivalents and $3.5 million and $1.0 million of restricted cash that is included in other non-current assets and other current assets, respectively, related to workers compensation deposits.

(2)	Includes $0.4 million that is included in cash and cash equivalents and $4.6 million of long-term restricted cash that is included in other non-current assets related to workers compensation deposits.

(3)	Included in short-term investments.

Estimated Fair Value Of Short-Term Investments By Contractual Maturity


	(in thousands)
Due within one year	$	108,382
Due after one year and through 5 years		180,373
Due after 5 years and through 10 years		—
Due after 10 years		1,003

Total short-term investments	$	289,758

- 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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