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Investments (Tables) | 9 Months Ended
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Sep. 30, 2013
Investments Debt And Equity Securities [Abstract] |
Fair Value of Available for Sale and Trading Investments | The fair value of short-term investments with maturities or estimated lives of less than one year consists of the following:
|  | September 30, 2013 |  |  | December 31, 2012 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Bankers’ acceptance drafts |  | $ | 330 |  |  | $ | 242 |
Time deposits |  |  | 77,577 |  |  |  | 52 |
Commercial paper and corporate obligations |  |  | 81,308 |  |  |  | — |
U.S. treasury obligations |  |  | — |  |  |  | 13,054 |
U.S. agency obligations |  |  | 205,702 |  |  |  | 313,514 |
|  |  | 364,917 |  |  |  | 326,862 |
Trading investments: |  |  |  |  |  |  |  |
Mutual funds |  |  | 959 |  |  |  | 791 |
|  | $ | 365,876 |  |  | $ | 327,653 |
Fair Value of Long-Term Available-for-Sale Investments | The fair value of long-term investments with maturities of more than one year consists of the following:
|  | September 30, 2013 |  |  | December 31, 2012 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits |  | $ | 56 |  |  | $ | — |
U.S. agency obligations |  |  | 5,127 |  |  |  | 12,158 |
|  | $ | 5,183 |  |  | $ | 12,158 |
Gross Unrealized Gains and (Losses) Aggregated by Investment Category Short-Term and Long-Term Securities | The following tables show the gross unrealized gains and (losses) aggregated by investment category for short-term and long-term available-for-sale investments:
As of September 30, 2013: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bankers’ acceptance drafts |  | $ | 330 |  |  | $ | — |  |  | $ | — |  |  | $ | 330 |
Time deposits |  |  | 77,575 |  |  |  | 5 |  |  |  | (3 | ) |  |  | 77,577 |
Commercial paper and corporate obligations |  |  | 81,300 |  |  |  | 10 |  |  |  | (2 | ) |  |  | 81,308 |
U.S. agency obligations |  |  | 205,639 |  |  |  | 63 |  |  |  | — |  |  |  | 205,702 |
|  | $ | 364,844 |  |  | $ | 78 |  |  | $ | (5 | ) |  | $ | 364,917 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 56 |  |  | $ | — |  |  | $ | — |  |  | $ | 56 |
U.S. agency obligations |  |  | 5,122 |  |  |  | 5 |  |  |  | — |  |  |  | 5,127 |
U.S. agency obligations |  | $ | 5,178 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 5,183 |
As of December 31, 2012: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 52 |  |  | $ | — |  |  | $ | — |  |  | $ | 52 |
Bankers’ acceptance drafts |  |  | 242 |  |  |  | — |  |  |  | — |  |  |  | 242 |
U.S. treasury obligations |  |  | 13,045 |  |  |  | 9 |  |  |  | — |  |  |  | 13,054 |
U.S. agency obligations |  |  | 313,262 |  |  |  | 258 |  |  |  | (6 | ) |  |  | 313,514 |
|  | $ | 326,601 |  |  | $ | 267 |  |  | $ | (6 | ) |  | $ | 326,862 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency obligations |  | $ | 12,156 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 12,158 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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