Farnam, Sullivan join board
Files prospectus for offering of preferred units
Drop in claims offsets decline in premiums
Stable outlook reflects firm's market position
Specialty insurer starts quarterly dividend program
Insurer records record underwriting profit in Q3
Ratings agency notes improved capital position
Q2 profits up 22% thanks to performance of Canadian operations
Also appoints new assistant VP reinsurance and risk management
Insurer appoints new executives