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Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments | Investments held are summarized as follows (in thousands):
|  | December 31, 2017 |  |  | December 31, 2016 |
|  | Short-Term |  |  | Long-Term |  |  | Short-Term |  |  | Long-Term |
Municipal debt securities |  | $ | 8,312 |  |  | $ | 46,195 |  |  | $ | 10,306 |  |  | $ | 46,513 |
Federal home loan securities |  |  | 1,000 |  |  |  | 30,322 |  |  |  | — |  |  |  | 28,747 |
Certificates of deposit |  |  | 980 |  |  |  | 4,165 |  |  |  | 980 |  |  |  | 3,715 |
|  | $ | 10,292 |  |  | $ | 80,682 |  |  | $ | 11,286 |  |  | $ | 78,975 |
Schedule of Contractual Maturities of Long-Term Investments | Contractual maturities of long-term investments are summarized as follows (in thousands):
|  | December 31, |
|  | 2017 |  |  | 2016 |
Due after one year through five years |  | $ | 78,561 |  |  | $ | 70,005 |
Due after five years through six years |  |  | 2,121 |  |  |  | 8,970 |
|  | $ | 80,682 |  |  | $ | 78,975 |

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