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Balance Sheet Information (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Total available-for-sale securities |  |  |
Amortized Cost | $ 267,303,000 |  | $ 281,489,000
Gains in Accumulated Other Comprehensive Income | 112,000 |  | 86,000
Losses in Accumulated Other Comprehensive Income | (13,000) |  | (37,000)
Estimated Fair Value | 267,402,000 |  | 281,538,000
Short-term investments, unrealized loss position fair value |  |  |
Less than 12 months, fair value | 25,916,000 |  | 66,722,000
Total, fair value | 25,916,000 |  | 66,722,000
Short-term investments, gross unrealized loss |  |  |
Less than 12 months, gross unrealized loss | (13,000) |  | (37,000)
Total, gross unrealized loss | (13,000) |  | (37,000)
Proceeds from sales and maturities of available-for-sale securities | 32,000,000 | 101,200,000 |
Gross realized gains on available-for-sale securities | 0 | 100,000 |
Estimated fair value of contractual maturities of available-for-sale securities |  |  |
Due in one year or less | 207,913,000 |  |
Due in 1-2 years | 47,621,000 |  |
Due in 2-3 years | 11,868,000 |  |
Total available-for-sale securities | 267,402,000 |  | 281,538,000
U.S. treasuries |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 130,889,000 |  | 130,956,000
Gains in Accumulated Other Comprehensive Income | 25,000 |  | 22,000
Losses in Accumulated Other Comprehensive Income |  |  | (1,000)
Estimated Fair Value | 130,914,000 |  | 130,977,000
Corporate debt |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 73,410,000 |  | 77,582,000
Gains in Accumulated Other Comprehensive Income | 76,000 |  | 55,000
Losses in Accumulated Other Comprehensive Income | (13,000) |  | (36,000)
Estimated Fair Value | 73,473,000 |  | 77,601,000
Short-term investments, unrealized loss position fair value |  |  |
Less than 12 months, fair value | 25,916,000 |  | 37,654,000
Total, fair value | 25,916,000 |  | 37,654,000
Short-term investments, gross unrealized loss |  |  |
Less than 12 months, gross unrealized loss | (13,000) |  | (36,000)
Total, gross unrealized loss | (13,000) |  | (36,000)
Government agency securities |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 59,004,000 |  | 61,004,000
Gains in Accumulated Other Comprehensive Income | 11,000 |  | 9,000
Estimated Fair Value | 59,015,000 |  | 61,013,000
Commercial paper |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 4,000,000 |  | 11,947,000
Estimated Fair Value | 4,000,000 |  | 11,947,000
U.S. treasuries |  |  |
Short-term investments, unrealized loss position fair value |  |  |
Less than 12 months, fair value |  |  | 29,068,000
Total, fair value |  |  | 29,068,000
Short-term investments, gross unrealized loss |  |  |
Less than 12 months, gross unrealized loss |  |  | (1,000)
Total, gross unrealized loss |  |  | $ (1,000)

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