XML 49 R36.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Reinsurance (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Insurance [Abstract] |
Schedule of the Effect of Reinsurance on Premiums Written and Earned | The effect of reinsurance on premiums written and earned in 2018, 2017 and 2016 was as follows:
|  | 2018 Premiums |  |  | 2017 Premiums |  |  | 2016 Premiums |
|  | Written |  |  | Earned |  |  | Written |  |  | Earned |  |  | Written |  |  | Earned |
|  | (in thousands) |
Gross |  | $ | 351,696 |  |  | $ | 359,670 |  |  | $ | 350,267 |  |  | $ | 355,025 |  |  | $ | 373,055 |  |  | $ | 379,011 |
Ceded |  |  | (9,344 | ) |  |  | (9,344 | ) |  |  | (8,869 | ) |  |  | (8,869 | ) |  |  | (10,307 | ) |  |  | (10,307 | )
Net premiums |  | $ | 342,352 |  |  | $ | 350,326 |  |  | $ | 341,398 |  |  | $ | 346,156 |  |  | $ | 362,748 |  |  | $ | 368,704 |
Schedule of the Amounts Recoverable from Reinsurers | The amounts recoverable from reinsurers consist of the following:
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  | (in thousands) |
Unpaid losses recoverable: |  |  |  |  |  |  |  |
Case basis |  | $ | 76,525 |  |  | $ | 66,061 |
Incurred but not reported |  |  | 30,691 |  |  |  | 18,828 |
Paid losses recoverable |  |  | 325 |  |  |  | 554 |
Experience-rated commissions recoverable |  |  | 4,465 |  |  |  | 4,690 |
Total |  | $ | 112,006 |  |  | $ | 90,133 |
Schedule of Unsecured Reinsurance Recoverables from Reinsurers |
Reinsurer |  | A.M. Best Rating |  | Amounts Recoverable as of December 31, 2018 |
|  |  |  | (in thousands) |
Hannover Reinsurance (Ireland) Limited (1) |  | A+ |  | $ | 53,609 |
Allianz Risk Transfer AG (Bermuda) (1) |  | A+ |  |  | 13,084 |
Odyssey America Reinsurance Corporation |  | A |  |  | 11,754 |
Minnesota Workers’ Compensation Reinsurance Association (1) |  | NR |  |  | 8,823 |
Other reinsurers |  |  |  |  | 24,736 |
Total amounts recoverable from reinsurers |  |  |  |  | 112,006 |
Funds withheld and letters of credit related to the above recoverables |  |  |  |  | (69,932 | )
Total unsecured amounts recoverable from reinsurers |  |  |  | $ | 42,074 |
(1) | Current participant in our 2019 reinsurance program.

X
- Definition Reinsurance Information. + References No definition available. + Details
Name: | amsf_ReinsuranceInformationTableTextBlock
Namespace Prefix: | amsf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reinsurance reserves recoverable. + References No definition available. + Details
Name: | amsf_ReinsuranceReservesRecoverableTableTextBlock
Namespace Prefix: | amsf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unsecured Reinsurance Reserves Recoverable Table [Text Block] + References No definition available. + Details
Name: | amsf_UnsecuredReinsuranceReservesRecoverableTableTextBlock
Namespace Prefix: | amsf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration