There are several good travel insurance companies who sell a one-year policy. A couple that I would suggest looking at to see if they'll work for you are Travel Safe and Allianz. Do not assume a big name is the best policy - we fired 3 of the biggest names in the business because of really bad customer service.
But you can go to the website insuremytrip.com and get a look at some other companies who may also provide extended travel insurance policies.
45 Cruises & Counting! Favorites: Paul Gauguin to Tahiti: Uniworld River Cruises in Europe; any of the Celebrity Solstice-class ships; Holland America for 12-nights in the Baltics & Russia; RCCL for 14-night Greek Isles, Turkey, & Croatia; Holland America for 14-day Alaska cruisetour; 10-night Canada/New England cruise; 21 days in Hawaii including a 7-night NCL cruise; Oceania for 25 days in Asia; & 3 months touring Europe by train. And many days spent in all-inclusive resorts!