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Reinsurance (Tables) | 12 Months Ended
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Dec. 31, 2015
Insurance [Abstract] |
Schedule of the Effect of Reinsurance on Premiums Written and Earned | The effect of reinsurance on premiums written and earned in 2015, 2014 and 2013 was as follows:
|  | 2015 Premiums |  |  | 2014 Premiums |  |  | 2013 Premiums |
|  | Written |  |  | Earned |  |  | Written |  |  | Earned |  |  | Written |  |  | Earned |
|  | (in thousands) |
Gross |  | $ | 386,529 |  |  | $ | 387,122 |  |  | $ | 393,819 |  |  | $ | 389,540 |  |  | $ | 372,177 |  |  | $ | 348,408 |
Ceded |  |  | (11,228 | ) |  |  | (11,228 | ) |  |  | (13,793 | ) |  |  | (13,793 | ) |  |  | (18,425 | ) |  |  | (18,425 | )
Net premiums |  | $ | 375,301 |  |  | $ | 375,894 |  |  | $ | 380,026 |  |  | $ | 375,747 |  |  | $ | 353,752 |  |  | $ | 329,983 |
Schedule of the Amounts Recoverable from Reinsurers | The amounts recoverable from reinsurers consist of the following:
|  | December 31, |
|  | 2015 |  |  | 2014 |
|  | (in thousands) |
Unpaid losses recoverable: |  |  |  |  |  |  |  |
Case basis |  | $ | 37,207 |  |  | $ | 34,196 |
Incurred but not reported |  |  | 27,651 |  |  |  | 25,138 |
Paid losses recoverable |  |  | 414 |  |  |  | 424 |
Experience-rated commissions recoverable |  |  | 25,805 |  |  |  | 26,130 |
Total |  | $ | 91,077 |  |  | $ | 85,888 |
Schedule of Unsecured Reinsurance Recoverables from Reinsurers | The A.M. Best Company rating for the reinsurer is shown parenthetically.
Hannover Reinsurance (Ireland) Limited (A+) |  | $ | 35,530 |
Odyssey America Reinsurance Corporation (A) |  |  | 12,127 |
Minnesota Workers’ Compensation Reinsurance Association (NR) |  |  | 9,034 |
Tokio Millenium Reinsurance Limited (A++) |  |  | 7,294 |
Clearwater Insurance Company (bbb) |  |  | 5,610 |
Other reinsurers |  |  | 21,482 |
Total reinsurance recoverables |  |  | 91,077 |
Letters of credit and funds held |  |  | (53,572 | )
Total unsecured reinsurance recoverables |  | $ | 37,505 |

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