UnitedHealth Group is a dividend grower with an impressive earnings track record.UnitedHealth Group (UNH 1.42%) stock hasn't performed well this year so far, but there's a consolation prize for long-term investors. Every three months, UnitedHealth Group distributes a cash payout to anyone who's a shareholder of record on the ex-dividend date.That's great news for income-oriented investors, but it shouldn't be your sole focus. It's essential to conduct your due diligence on the company itself, especially sin ...