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Investments (Tables) | 6 Months Ended
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Jun. 30, 2014
Investments Debt And Equity Securities [Abstract] |
Summary of Investments | Investments at June 30, 2014 and December 31, 2013 consisted of the following:
|  | June 30, 2014 Carrying Value |  |  | December 31,2013 Carrying Value |
(in thousands) |  | Current |  |  | Non- Current |  |  | Current |  |  | Non- Current |
Certificates of deposit, U.S. Treasury securities and obligations of U.S. Government agencies, Corporate debt and other securities |  | $ | 12,300 |  |  | $ | 19,021 |  |  | $ | 10,624 |  |  | $ | 16 |

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