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Investments (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments | Investments held are summarized as follows (in thousands):
|  | December 31, 2014 |  |  | December 31, 2013 |
|  | Short-Term |  |  | Long-Term |  |  | Short-Term |  |  | Long-Term |
Municipal debt securities |  | $ | 5,539 |  |  | $ | 35,827 |  |  | $ | 5,492 |  |  | $ | 34,495 |
Federal home loan securities |  |  | — |  |  |  | 27,030 |  |  |  | — |  |  |  | 22,520 |
Certificates of deposit |  |  | 496 |  |  |  | 1,225 |  |  |  | 965 |  |  |  | 496 |
|  | $ | 6,035 |  |  | $ | 64,082 |  |  | $ | 6,457 |  |  | $ | 57,511 |
Schedule of Contractual Maturities of Long-Term Investments | Contractual maturities of long-term investments are summarized as follows (in thousands):
|  | December 31, |
|  | 2014 |  |  | 2013 |
Due after one year through five years |  | $ | 54,959 |  |  | $ | 41,655 |
Due after five years through seven years |  |  | 9,123 |  |  |  | 15,856 |
|  | $ | 64,082 |  |  | $ | 57,511 |

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