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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables) | 3 Months Ended
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Mar. 31, 2013
Cash, Cash Equivalents, and Short-term Investments [Abstract] |
Investments | Investments at March 31, 2013 consisted of the following (in thousands):
|  | Amortized |  | Unrealized |  | Aggregate Fair
Investment Classification |  | Cost |  | Gains |  | (Losses) |  | Market Value
March 31, 2013 – |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 8,447 |  |  | $ | 4 |  |  | $ | (7 | ) |  | $ | 8,444 |
Commercial paper |  | 1,998 |  |  | — |  |  | — |  |  | 1,998 |
Corporate bonds |  | 162,356 |  |  | 12 |  |  | (30 | ) |  | 162,338 |
U.S. government bonds |  | 3,099 |  |  | — |  |  | — |  |  | 3,099 |
Convertible notes |  | 4,300 |  |  | — |  |  | — |  |  | 4,300 |
|  | $ | 180,200 |  |  | $ | 16 |  |  | $ | (37 | ) |  | $ | 180,179 |
Investments at December 31, 2012 consisted of the following (in thousands):
|  | Amortized |  | Unrealized |  | Aggregate Fair
Investment Classification |  | Cost |  | Gains |  | (Losses) |  | Market Value
December 31, 2012 – |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 7,562 |  |  | $ | 3 |  |  | $ | (5 | ) |  | $ | 7,560 |
Commercial paper |  | 2,997 |  |  | — |  |  | — |  |  | 2,997 |
Corporate bonds |  | 141,349 |  |  | 9 |  |  | (25 | ) |  | 141,333 |
U.S. government bonds |  | 3,098 |  |  | — |  |  | — |  |  | 3,098 |
Convertible notes |  | 4,300 |  |  | — |  |  | — |  |  | 4,300 |
|  | $ | 159,306 |  |  | $ | 12 |  |  | $ | (30 | ) |  | $ | 159,288 |

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- Definition Tabular disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References No definition available. + Details
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