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Investments: | 12 Months Ended
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Dec. 31, 2012
Investments: | 3. Investments: Investments held are summarized as follows (in thousands):
|  | December 31, 2012 |  |  | December 31, 2011 |
|  | Short-Term |  |  | Long-Term |  |  | Short-Term |  |  | Long-Term |
Municipal debt securities |  | $ | 6,088 |  |  | $ | 27,563 |  |  | $ | 4,139 |  |  | $ | 26,964 |
Federal home loan securities |  |  | — |  |  |  | 18,569 |  |  |  | — |  |  |  | 18,027 |
Certificates of deposit |  |  | 496 |  |  |  | 1,461 |  |  |  | — |  |  |  | — |
|  | $ | 6,584 |  |  | $ | 47,593 |  |  | $ | 4,139 |  |  | $ | 44,991 |

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