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Guarantees (Tables) | 12 Months Ended
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Dec. 31, 2017
Guarantees [Abstract] |
Letters of credit and surety bonds outstanding | At December 31, 2017 and 2016, we had letters of credit and surety bonds outstanding, which primarily guarantee various insurance activities as noted in the following table:
|  | December 31,
|  | 2017 |  | 2016
|  | (In thousands)
Letters of credit |  | $ | 238,610 |  |  | 240,420 |
Surety bonds |  | 111,007 |  |  | 113,696 |

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