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Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 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 | $ 21,909 | $ 32,183
Due in 1-2 years | 7,070 | 13,922
Total | 28,979 | 46,105
Investments by rolling maturity, Unrealized Gains |  |
Due within 1 year | 13 | 14
Due in 1-2 years |  | 9
Total | 13 | 23
Investments by rolling maturity, Unrealized Losses |  |
Due within 1 year | (5) | (5)
Due in 1-2 years | (15) | (5)
Total | (20) | (10)
Investments by rolling maturity, Fair Value |  |
Due within 1 year | 21,917 | 32,192
Due in 1-2 years | 7,055 | 13,926
Total | 28,972 | 46,118
Short-term investments. |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 2,188 | 12,213
Unrealized Losses | (5) | (5)
Fair Value | 2,183 | 12,208
Investments by rolling maturity, Unrealized Gains |  |
Total | 13 | 14
Investments by rolling maturity, Unrealized Losses |  |
Total | (5) | (5)
Short-term investments. | U.S. government-sponsored enterprise bonds |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 2,188 |
Unrealized Losses | (5) |
Fair Value | 2,183 |
Investments by rolling maturity, Unrealized Gains |  |
Total | 1 |
Investments by rolling maturity, Unrealized Losses |  |
Total |  | (1)
Short-term investments. | U S government-sponsored enterprise and municipal bonds |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost |  | 5,289
Unrealized Losses |  | (1)
Fair Value |  | 5,288
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 | 10 | 2
Investments by rolling maturity, Unrealized Losses |  |
Total | (5) | (2)
Short-term investments. | Certificates of deposit |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost |  | 3,080
Unrealized Losses |  | (2)
Fair Value |  | 3,078
Investments by rolling maturity, Unrealized Gains |  |
Total | 1 | 1
Investments by rolling maturity, Unrealized Losses |  |
Total |  | (2)
Long-term investments |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 7,070 | 3,694
Unrealized Losses | (15) | (5)
Fair Value | 7,055 | 3,689
Investments by rolling maturity, Unrealized Gains |  |
Total |  | 9
Investments by rolling maturity, Unrealized Losses |  |
Total | (15) | (5)
Long-term investments | U.S. government-sponsored enterprise bonds |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 1,000 | 1,253
Unrealized Losses | (5) |
Fair Value | 995 | 1,253
Investments by rolling maturity, Unrealized Losses |  |
Total | (5) |
Long-term investments | Corporate notes |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 6,070 | 1,001
Unrealized Losses | (10) | (1)
Fair Value | 6,060 | 1,000
Investments by rolling maturity, Unrealized Gains |  |
Total |  | 9
Investments by rolling maturity, Unrealized Losses |  |
Total | (10) | (1)
Long-term investments | Certificates of deposit |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost |  | 1,440
Unrealized Losses |  | (4)
Fair Value |  | 1,436
Investments by rolling maturity, Unrealized Losses |  |
Total |  | $ (4)

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the next rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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