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Reinsurance (Tables) | 6 Months Ended
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Jun. 30, 2018
Retrocession Arrangements And Reinsurance Ceded Receivables [Abstract] |
Ceded Credit Risk [Table Text Block] | The following table presents information for the Company’s reinsurance ceded receivable assets, including the respective amount and A.M. Best rating for each reinsurer representing in excess of five percent of the total as of June 30, 2018 or December 31, 2017 (dollars in thousands):
|  |  |  | June 30, 2018 |  | December 31, 2017
Reinsurer |  | A.M. Best Rating |  | Amount |  | % of Total |  | Amount |  | % of Total
Reinsurer A |  | A+ |  | $ | 312,405 |  |  | 39.6 |  |  | $ | 301,478 |  |  | 38.6 | %
Reinsurer B |  | A+ |  | 198,782 |  |  | 25.2 |  |  | 203,898 |  |  | 26.1 |
Reinsurer C |  | A |  | 67,699 |  |  | 8.6 |  |  | 67,723 |  |  | 8.7 |
Reinsurer D |  | A+ |  | 41,807 |  |  | 5.3 |  |  | 40,528 |  |  | 5.2 |
Reinsurer E |  | A++ |  | 38,935 |  |  | 4.9 |  |  | 40,592 |  |  | 5.2 |
Other reinsurers |  |  |  | 129,801 |  |  | 16.4 |  |  | 127,808 |  |  | 16.2 |
Total |  |  |  | $ | 789,429 |  |  | 100.0 | % |  | $ | 782,027 |  |  | 100.0 | %

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- Definition Tabular disclosure of reinsurer or group of reinsurers for whom the entity has a concentration of credit risk. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195 + Details
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