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Balance Sheet Information (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Total available-for-sale securities |  |  |  |  |
Amortized Cost | $ 222,823,000 |  | $ 222,823,000 |  | $ 281,489,000
Gains in Accumulated Other Comprehensive Income | 136,000 |  | 136,000 |  | 86,000
Losses in Accumulated Other Comprehensive Income | (5,000) |  | (5,000) |  | (37,000)
Estimated Fair Value | 222,954,000 |  | 222,954,000 |  | 281,538,000
Short-term investments, unrealized loss position fair value |  |  |  |  |
Less than 12 months, fair value | 22,227,000 |  | 22,227,000 |  | 66,722,000
Short-term investments, gross unrealized loss |  |  |  |  |
Less than 12 months, gross unrealized loss | (5,000) |  | (5,000) |  | (37,000)
Proceeds from sales and maturities of available-for-sale securities | 94,800,000 | 150,500,000 | 216,100,000 | 422,900,000 |
Gross realized gains on available-for-sale securities |  |  |  | 100,000 |
Estimated fair value of contractual maturities of available-for-sale securities |  |  |  |  |
Due in one year or less | 135,948,000 |  | 135,948,000 |  |
Due in 1-2 years | 87,006,000 |  | 87,006,000 |  |
Total available-for-sale securities | 222,954,000 |  | 222,954,000 |  | 281,538,000
U.S. treasuries |  |  |  |  |
Total available-for-sale securities |  |  |  |  |
Amortized Cost | 90,523,000 |  | 90,523,000 |  | 130,956,000
Gains in Accumulated Other Comprehensive Income | 35,000 |  | 35,000 |  | 22,000
Losses in Accumulated Other Comprehensive Income | (1,000) |  | (1,000) |  | (1,000)
Estimated Fair Value | 90,557,000 |  | 90,557,000 |  | 130,977,000
Short-term investments, unrealized loss position fair value |  |  |  |  |
Less than 12 months, fair value | 15,006,000 |  | 15,006,000 |  | 29,068,000
Short-term investments, gross unrealized loss |  |  |  |  |
Less than 12 months, gross unrealized loss | (1,000) |  | (1,000) |  | (1,000)
Corporate debt |  |  |  |  |
Total available-for-sale securities |  |  |  |  |
Amortized Cost | 69,109,000 |  | 69,109,000 |  | 77,582,000
Gains in Accumulated Other Comprehensive Income | 93,000 |  | 93,000 |  | 55,000
Losses in Accumulated Other Comprehensive Income | (4,000) |  | (4,000) |  | (36,000)
Estimated Fair Value | 69,198,000 |  | 69,198,000 |  | 77,601,000
Short-term investments, unrealized loss position fair value |  |  |  |  |
Less than 12 months, fair value | 7,221,000 |  | 7,221,000 |  | 37,654,000
Short-term investments, gross unrealized loss |  |  |  |  |
Less than 12 months, gross unrealized loss | (4,000) |  | (4,000) |  | (36,000)
Government agency securities |  |  |  |  |
Total available-for-sale securities |  |  |  |  |
Amortized Cost | 63,191,000 |  | 63,191,000 |  | 61,004,000
Gains in Accumulated Other Comprehensive Income | 8,000 |  | 8,000 |  | 9,000
Estimated Fair Value | 63,199,000 |  | 63,199,000 |  | 61,013,000
Commercial paper |  |  |  |  |
Total available-for-sale securities |  |  |  |  |
Amortized Cost |  |  |  |  | 11,947,000
Estimated Fair Value |  |  |  |  | $ 11,947,000

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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