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Guarantees (Tables) | 12 Months Ended
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Dec. 31, 2018
Guarantees [Abstract] |
Letters of credit and surety bonds outstanding | At December 31, 2018 and 2017, we had letters of credit and surety bonds outstanding, which primarily guarantee various insurance activities as noted in the following table:
|  | December 31,
|  | 2018 |  | 2017
|  | (In thousands)
Letters of credit |  | $ | 253,259 |  |  | 238,610 |
Surety bonds |  | 121,757 |  |  | 111,007 |

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