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FINANCIAL INSTRUMENTS (Tables) | 3 Months Ended
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Mar. 31, 2014
Fair Value Disclosures [Abstract] |
Cash and Cash Equivalents and Investments from Continuing Operations | Cash and cash equivalents from our continuing operations consist of the following as of March 31, 2014 and December 31, 2013 (dollars in thousands):
|  | March 31, 2014 |  |  | December 31, 2013 |
Cash |  | $ | 175,739 |  |  | $ | 155,756 |
Corporate bonds |  |  | 1,006 |  |  |  | — |
Money market funds |  |  | 87,443 |  |  |  | 163,005 |
Cash and cash equivalents, unrestricted |  |  | 264,188 |  |  |  | 318,761 |
Restricted cash |  |  | 12,948 |  |  |  | 12,564 |
Total cash and cash equivalents |  | $ | 277,136 |  |  | $ | 331,325 |
Investments from Continuing Operations | Investments from our continuing operations consist of the following as of March 31, 2014 and December 31, 2013 (dollars in thousands):
|  | March 31, 2014 |
|  |  |  |  | Gross Unrealized |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 15,641 |  |  | $ | — |  |  | $ | (5 | ) |  | $ | 15,636 |
Corporate bonds |  |  | 5,443 |  |  |  | — |  |  |  | (7 | ) |  |  | 5,436 |
U.S. Treasury bills |  |  | 17,253 |  |  |  | 1 |  |  |  | — |  |  |  | 17,254 |
Total short-term investments |  |  | 38,337 |  |  |  | 1 |  |  |  | (12 | ) |  |  | 38,326 |
Long-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 8,723 |  |  |  | — |  |  |  | (17 | ) |  |  | 8,706 |
Municipal bond |  |  | 7,850 |  |  |  | — |  |  |  | (476 | ) |  |  | 7,374 |
Total long-term investments |  |  | 16,573 |  |  |  | — |  |  |  | (493 | ) |  |  | 16,080 |
Total investments (available for sale) |  | $ | 54,910 |  |  | $ | 1 |  |  | $ | (505 | ) |  | $ | 54,406 |
|  | December 31, 2013 |
|  |  |  |  | Gross Unrealized |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury bills |  | $ | 31,591 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 31,592 |
Long-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bond |  |  | 7,850 |  |  |  | — |  |  |  | (476 | ) |  |  | 7,374 |
Total investments (available for sale) |  | $ | 39,441 |  |  | $ | 1 |  |  | $ | (476 | ) |  | $ | 38,966 |
Investments Measured at Fair Value on Recurring Basis | Investments measured at fair value on a recurring basis subject to the disclosure requirements of FASB ASC Topic 820—Fair Value Measurements at March 31, 2014 and December 31, 2013 were as follows (dollars in thousands):
|  | As of March 31, 2014 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Commercial paper |  | $ | — |  |  | $ | 15,636 |  |  | $ | — |  |  | $ | 15,636 |
Corporate bonds |  |  | — |  |  |  | 14,142 |  |  |  | — |  |  |  | 14,142 |
U.S. Treasury bills |  |  | — |  |  |  | 17,254 |  |  |  | — |  |  |  | 17,254 |
Municipal bond |  |  | — |  |  |  | — |  |  |  | 7,374 |  |  |  | 7,374 |
Totals |  | $ | — |  |  | $ | 47,032 |  |  | $ | 7,374 |  |  | $ | 54,406 |
|  | As of December 31, 2013 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
U.S. Treasury bills |  | $ | 31,592 |  |  | $ | — |  |  | $ | — |  |  | $ | 31,592 |
Municipal bond |  |  | — |  |  |  | — |  |  |  | 7,374 |  |  |  | 7,374 |
Totals |  | $ | 31,592 |  |  | $ | — |  |  | $ | 7,374 |  |  | $ | 38,966 |
Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) | The following table presents a rollforward of our assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as defined in FASB ASC Topic 820 for the quarter ended March 31, 2014 (dollars in thousands):
Balance at December 31, 2013 |  | $ | 7,374 |
Unrealized gain (loss) |  |  | — |
Balance at March 31, 2014 |  | $ | 7,374 |

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