The safest way to thaw is in the fridge.  A good rule to follow is to allow the meat to thaw 24 hours for every 4 pounds. This means if it is 14 pounds, it will take 3 1/2 days for it to thaw.  Place the packaged bird on a baking tray, large platter, or small roasting pan and let it thaw in the fridge. See what the USDA says about thawing meat safely.