Sales edged up 2.3% to $2.841 billion, topping estimates of $2.796 billion.iStockPhoto View Enlarged ImageThe company said costs rose mainly because of higher usage in certain large group accounts and higher-than-expected Medicaid health costs for seniors and people with disabilities.WellCare's Q2 EPS plunged 30% to $1.24, beating Wall Street's outlook by 3 cents.