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Reinsurance (Tables) | 12 Months Ended
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Dec. 31, 2017
Insurance [Abstract] |
Schedule of the Effect of Reinsurance on Premiums Written and Earned | The effect of reinsurance on premiums written and earned in 2017, 2016 and 2015 was as follows:
|  | 2017 Premiums |  |  | 2016 Premiums |  |  | 2015 Premiums |
|  | Written |  |  | Earned |  |  | Written |  |  | Earned |  |  | Written |  |  | Earned |
|  | (in thousands) |
Gross |  | $ | 350,267 |  |  | $ | 355,025 |  |  | $ | 373,055 |  |  | $ | 379,011 |  |  | $ | 386,529 |  |  | $ | 387,122 |
Ceded |  |  | (8,869 | ) |  |  | (8,869 | ) |  |  | (10,307 | ) |  |  | (10,307 | ) |  |  | (11,228 | ) |  |  | (11,228 | )
Net premiums |  | $ | 341,398 |  |  | $ | 346,156 |  |  | $ | 362,748 |  |  | $ | 368,704 |  |  | $ | 375,301 |  |  | $ | 375,894 |
Schedule of the Amounts Recoverable from Reinsurers | The amounts recoverable from reinsurers consist of the following:
|  | December 31, |
|  | 2017 |  |  | 2016 |
|  | (in thousands) |
Unpaid losses recoverable: |  |  |  |  |  |  |  |
Case basis |  | $ | 66,061 |  |  | $ | 49,361 |
Incurred but not reported |  |  | 18,828 |  |  |  | 28,895 |
Paid losses recoverable |  |  | 554 |  |  |  | 485 |
Experience-rated commissions recoverable |  |  | 4,690 |  |  |  | 4,925 |
Total |  | $ | 90,133 |  |  | $ | 83,666 |
Schedule of Unsecured Reinsurance Recoverables from Reinsurers |
Reinsurer |  | A.M. Best Rating |  | Amounts Recoverable as of December 31, 2017 |
|  |  |  | (in thousands) |
Hannover Reinsurance Limited (Ireland) (1) |  | A+ |  | $ | 36,905 |
Odyssey America Reinsurance Corporation |  | A |  |  | 12,464 |
Minnesota Workers’ Compensation Reinsurance Association (1) |  | NR |  |  | 7,761 |
Allianz Risk Transfer AG (Bermuda) (1) |  | A+ |  |  | 7,551 |
Clearwater Insurance (2) |  | NR |  |  | 5,755 |
Other reinsurers |  |  |  |  | 19,697 |
Total amounts recoverable from reinsurers |  |  |  |  | 90,133 |
Funds withheld and letters of credit related to the above recoverables |  |  |  |  | (47,719 | )
Total unsecured amounts recoverable from reinsurers |  |  |  | $ | 42,414 |
(1) | Current participant in our 2018 reinsurance program.
(2) | Subsidiary of Fairfax Financial is no longer rated by A.M. Best.

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