OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has downgraded the Financial Strength Rating (FSR) to A- (Excellent) from A (Excellent) and the Long-Term Issuer Credit Ratings (Long-Term ICR) to “a-” from “a” of DuraRock Reinsurance, Ltd. (DuraRock) (St. Michael, Barbados). The outlook of these Credit Ratings (ratings) has been revised to stable from negative. Concurrently, A.M. Best has affirmed the FSR of A (Excellent) and the Long-Term ICR of “a” of Cherokee Insurance Company (Cherokee) (Port Huro