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Investments | 3 Months Ended
--- | ---
Mar. 31, 2013
Investments Debt And Equity Securities [Abstract] |
Investments |
3) | Investments
The fair value of short-term investments with maturities or estimated lives of less than one year consists of the following:
|  | March 31, 2013 |  |  | December 31, 2012 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits |  | $ | — |  |  | $ | 52 |
Bankers’ acceptance drafts |  |  | 93 |  |  |  | 242 |
U.S. treasury obligations |  |  | 13,042 |  |  |  | 13,054 |
U.S. agency obligations |  |  | 317,686 |  |  |  | 313,514 |
|  | $ | 330,821 |  |  | $ | 326,862 |
Trading investments: |  |  |  |  |  |  |  |
Mutual funds |  |  | 813 |  |  |  | 791 |
|  | $ | 331,634 |  |  | $ | 327,653 |
The fair value of long-term available-for-sale investments with maturities of more than one year consists of the following:
|  | March 31, 2013 |  |  | December 31, 2012 |
Time deposits |  | $ | 53 |  |  | $ | — |
U.S. agency obligations |  |  | 10,104 |  |  |  | 12,158 |
|  | $ | 10,157 |  |  | $ | 12,158 |
The following tables show the gross unrealized gains and (losses) aggregated by investment category for short-term and long-term available-for-sale investments:
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of March 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bankers’ acceptance drafts |  | $ | 93 |  |  | $ | — |  |  | $ | — |  |  | $ | 93 |
U.S. treasury obligations |  |  | 13,036 |  |  |  | 6 |  |  |  | — |  |  |  | 13,042 |
U.S. agency obligations |  |  | 317,517 |  |  |  | 171 |  |  |  | (2 | ) |  |  | 317,686 |
|  | $ | 330,646 |  |  | $ | 177 |  |  | $ | (2 | ) |  | $ | 330,821 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 53 |  |  | $ | — |  |  | $ | — |  |  | $ | 53 |
U.S. agency obligations |  |  | 10,099 |  |  |  | 5 |  |  |  | — |  |  |  | 10,104 |
|  | $ | 10,152 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 10,157 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
Interest income is accrued as earned. Dividend income is recognized as income on the date the stock trades “ex-dividend.” The cost of marketable securities sold is determined by the specific identification method. Realized gains or losses are reflected in income and were not material for the three months ended March 31, 2013 and 2012, respectively. The unrealized gains and losses for trading investments were immaterial for the three months ended March 31, 2013 and 2012.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3, 19, 20, 21, 22, 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 8: 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=6872113&loc=d3e27357-111563 Reference 9: 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=6872113&loc=d3e27161-111563 Reference 10: 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=6872113&loc=d3e27290-111563 + Details
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