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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 2013
Cash, Cash Equivalents, and Short-term Investments [Abstract] |
Investments | Investments at June 30, 2013 consisted of the following (in thousands):
|  | Amortized |  | Unrealized |  | Aggregate Fair
Investment Classification |  | Cost |  | Gains |  | (Losses) |  | Market Value
June 30, 2013 – |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 9,117 |  |  | $ | 3 |  |  | $ | (12 | ) |  | $ | 9,108 |
Commercial paper |  | 2,000 |  |  | — |  |  | — |  |  | 2,000 |
Corporate bonds |  | 151,255 |  |  | 38 |  |  | (9 | ) |  | 151,284 |
U.S. government bonds |  | 3,074 |  |  | — |  |  | (2 | ) |  | 3,072 |
Convertible notes |  | 4,300 |  |  | — |  |  | — |  |  | 4,300 |
|  | $ | 169,746 |  |  | $ | 41 |  |  | $ | (23 | ) |  | $ | 169,764 |
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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