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Investments | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Investments | 3. Investments: Investments held are summarized as follows (in thousands):
|  | December 31, 2016 |  |  | December 31, 2015 |
|  | Short-Term |  |  | Long-Term |  |  | Short-Term |  |  | Long-Term |
Municipal debt securities |  | $ | 10,306 |  |  | $ | 46,513 |  |  | $ | 8,608 |  |  | $ | 34,858 |
Federal home loan securities |  |  | — |  |  |  | 28,747 |  |  |  | — |  |  |  | 26,715 |
Certificates of deposit |  |  | 980 |  |  |  | 3,715 |  |  |  | 245 |  |  |  | 1,715 |
|  | $ | 11,286 |  |  | $ | 78,975 |  |  | $ | 8,853 |  |  | $ | 63,288 |
Contractual maturities of long-term investments are summarized as follows (in thousands):
|  | December 31, |
|  | 2016 |  |  | 2015 |
Due after one year through five years |  | $ | 70,005 |  |  | $ | 60,383 |
Due after five years through seven years |  |  | 8,970 |  |  |  | 2,905 |
|  | $ | 78,975 |  |  | $ | 63,288 |

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