Arch Capital Group Ltd. (ACGL) writes insurance and reinsurance on an around the world basis. The Company operates in two underwriting segments: insurance and reinsurance and mortgage. The insurance segment’s product lines include construction and national accounts; excess and surplus casualty; lenders products; professional lines; programs; property, energy, marine and aviation; travel, accident and health, and other (consisting of alternative markets, excess workers' compensation and surety business). The reinsurance segment’s product lines include casualty; marine and aviation; other specialty; property catastrophe; property excluding property catastrophe, and other (consisting of life reinsurance, casualty clash and other). The mortgage segment consists of the Company’s mortgage insurance and reinsurance business and includes the results of Arch MI U.S., which provides mortgage insurance to banks and other lenders across the nation, including existing credit union customers.