Associated Press: The owner of the oil rig that exploded in the Gulf of Mexico said it will lose more than a half billion dollars in revenue, and its finances will be hampered by hefty fees from a growing pile of lawsuits. Transocean Ltd. also revealed Wednesday in a 73-page regulatory filing that the Justice Department has requested that it preserve information about the explosion that occurred April 20. A Justice Department spokesman couldn’t be reached for comment. The world’s largest …