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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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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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