A major health insurance company is leaving Montana, saying it’s no longer profitable to do business in the state. The move will force about 11,000 Montanans to choose different health plans next year. It’s part of a nationwide trend. PacificSource is one of three insurance companies that offer health plans on the Affordable Care Act Marketplace, also known as Obamacare. The company says it will leave the marketplace in Montana, Oregon and Idaho next year.