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Balance Sheet Information (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Total available-for-sale securities
Amortized Cost	$ 252,040,000		$ 252,040,000		$ 281,489,000
Gains in Accumulated Other Comprehensive Income	127,000		127,000		86,000
Losses in Accumulated Other Comprehensive Income	(2,000)		(2,000)		(37,000)
Estimated Fair Value	252,165,000		252,165,000		281,538,000
Short-term investments, unrealized loss position fair value
Less than 12 months, fair value	3,350,000		3,350,000		66,722,000
Short-term investments, gross unrealized loss
Less than 12 months, gross unrealized loss	(2,000)		(2,000)		(37,000)
Proceeds from sales and maturities of available-for-sale securities	89,200,000	171,200,000	121,200,000	272,400,000
Estimated fair value of contractual maturities of available-for-sale securities
Due in one year or less	212,814,000		212,814,000
Due in 1-2 years	39,351,000		39,351,000
Total available-for-sale securities	252,165,000		252,165,000		281,538,000
U.S. treasuries
Total available-for-sale securities
Amortized Cost	123,672,000		123,672,000		130,956,000
Gains in Accumulated Other Comprehensive Income	12,000		12,000		22,000
Losses in Accumulated Other Comprehensive Income					(1,000)
Estimated Fair Value	123,684,000		123,684,000		130,977,000
Corporate debt
Total available-for-sale securities
Amortized Cost	65,176,000		65,176,000		77,582,000
Gains in Accumulated Other Comprehensive Income	111,000		111,000		55,000
Losses in Accumulated Other Comprehensive Income	(2,000)		(2,000)		(36,000)
Estimated Fair Value	65,285,000		65,285,000		77,601,000
Short-term investments, unrealized loss position fair value
Less than 12 months, fair value	3,350,000		3,350,000		37,654,000
Short-term investments, gross unrealized loss
Less than 12 months, gross unrealized loss	(2,000)		(2,000)		(36,000)
Government agency securities
Total available-for-sale securities
Amortized Cost	63,192,000		63,192,000		61,004,000
Gains in Accumulated Other Comprehensive Income	4,000		4,000		9,000
Estimated Fair Value	63,196,000		63,196,000		61,013,000
Commercial paper
Total available-for-sale securities
Amortized Cost					11,947,000
Estimated Fair Value					11,947,000
U.S. treasuries
Short-term investments, unrealized loss position fair value
Less than 12 months, fair value					29,068,000
Short-term investments, gross unrealized loss
Less than 12 months, gross unrealized loss					$ (1,000)

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