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Investments | 6 Months Ended
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Jun. 30, 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:
|  | June 30, 2013 |  |  | December 31, 2012 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Bankers’ acceptance drafts |  | $ | 145 |  |  | $ | 242 |
Time deposits |  |  | 52,157 |  |  |  | 52 |
Commercial paper |  |  | 46,495 |  |  |  | — |
U.S. treasury obligations |  |  | 5,004 |  |  |  | 13,054 |
U.S. agency obligations |  |  | 242,000 |  |  |  | 313,514 |
|  |  | 345,801 |  |  |  | 326,862 |
Trading investments: |  |  |  |  |  |  |  |
Mutual funds |  |  | 914 |  |  |  | 791 |
|  | $ | 346,715 |  |  | $ | 327,653 |
The fair value of long-term investments with maturities of more than one year consists of the following:
|  | June 30, 2013 |  |  | December 31, 2012 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits |  | $ | 54 |  |  | $ | — |
U.S. agency obligations |  |  | 15,734 |  |  |  | 12,158 |
|  | $ | 15,788 |  |  | $ | 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 June 30, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bankers’ acceptance drafts |  | $ | 145 |  |  | $ | — |  |  | $ | — |  |  | $ | 145 |
Time deposits |  |  | 52,157 |  |  |  | — |  |  |  | — |  |  |  | 52,157 |
Commercial paper |  |  | 46,495 |  |  |  | — |  |  |  | — |  |  |  | 46,495 |
U.S. treasury obligations |  |  | 5,003 |  |  |  | 1 |  |  |  | — |  |  |  | 5,004 |
U.S. agency obligations |  |  | 241,992 |  |  |  | 26 |  |  |  | (18 | ) |  |  | 242,000 |
|  | $ | 345,792 |  |  | $ | 27 |  |  | $ | (18 | ) |  | $ | 345,801 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 54 |  |  | $ | — |  |  | $ | — |  |  | $ | 54 |
U.S. agency obligations |  |  | 15,736 |  |  |  | 1 |  |  |  | (3 | ) |  |  | 15,734 |
U.S. agency obligations |  | $ | 15,790 |  |  | $ | 1 |  |  | $ | (3 | ) |  | $ | 15,788 |
|  | 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 and six months ended June 30, 2013 and 2012, respectively. The gains and (losses) for trading investments were immaterial for the three and six months ended June 30, 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 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 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 4: 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 5: 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=27724398&loc=d3e27232-111563 Reference 6: 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 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 Reference 8: 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=27724398&loc=d3e27405-111563 Reference 9: 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 + Details
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