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Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 Item | Dec. 31, 2013
Estimated fair values of available-for-sale securities with unrealized losses |  |
Number of maturity groups | 2 |
Investments by rolling maturity, Cost |  |
Due within 1 year | $ 32,720 | $ 32,183
Due in 1-2 years | 10,839 | 13,922
Total | 43,559 | 46,105
Investments by rolling maturity, Unrealized Gains |  |
Due within 1 year | 21 | 14
Due in 1-2 years | 4 | 9
Total | 25 | 23
Investments by rolling maturity, Unrealized Losses |  |
Due within 1 year | (2) | (5)
Due in 1-2 years | (19) | (5)
Total | (21) | (10)
Investments by rolling maturity, Fair Value |  |
Due within 1 year | 32,739 | 32,192
Due in 1-2 years | 10,824 | 13,926
Total | 43,563 | 46,118
Short-term investments |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 4,612 | 12,213
Unrealized Losses | (2) | (5)
Fair Value | 4,610 | 12,208
Investments by rolling maturity, Unrealized Gains |  |
Total | 21 | 14
Investments by rolling maturity, Unrealized Losses |  |
Total | (2) | (5)
Short-term investments | U.S. government debt securities |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 2,012 | 5,289
Unrealized Losses | (1) | (1)
Fair Value | 2,011 | 5,288
Investments by rolling maturity, Unrealized Gains |  |
Total | 7 | 11
Investments by rolling maturity, Unrealized Losses |  |
Total | (1) | (1)
Short-term investments | Corporate notes |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost |  | 3,844
Unrealized Losses |  | (2)
Fair Value |  | 3,842
Investments by rolling maturity, Unrealized Gains |  |
Total | 13 | 2
Investments by rolling maturity, Unrealized Losses |  |
Total |  | (2)
Short-term investments | Certificates of deposit |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 2,600 | 3,080
Unrealized Losses | (1) | (2)
Fair Value | 2,599 | 3,078
Investments by rolling maturity, Unrealized Gains |  |
Total | 1 | 1
Investments by rolling maturity, Unrealized Losses |  |
Total | (1) | (2)
Long-term investments |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 8,828 | 3,694
Unrealized Losses | (19) | (5)
Fair Value | 8,809 | 3,689
Investments by rolling maturity, Unrealized Gains |  |
Total | 4 | 9
Investments by rolling maturity, Unrealized Losses |  |
Total | (19) | (5)
Long-term investments | U.S. government debt securities |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 2,801 | 1,253
Unrealized Losses | (6) |
Fair Value | 2,795 | 1,253
Investments by rolling maturity, Unrealized Losses |  |
Total | (6) |
Long-term investments | Corporate notes |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 4,827 | 1,001
Unrealized Losses | (11) | (1)
Fair Value | 4,816 | 1,000
Investments by rolling maturity, Unrealized Gains |  |
Total | 4 | 9
Investments by rolling maturity, Unrealized Losses |  |
Total | (11) | (1)
Long-term investments | Certificates of deposit |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 1,200 | 1,440
Unrealized Losses | (2) | (4)
Fair Value | 1,198 | 1,436
Investments by rolling maturity, Unrealized Losses |  |
Total | $ (2) | $ (4)

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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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