Whit Mayo at Robert W. Baird has joined the unanimous chorus of analyst 'buy' ratings on Acadia Healthcare. Where he has set himself apart is in putting a $20 price target on shares of the Franklin-based behavioral hospital chain, whereas everyone else tracking the company is a few dollars below. Shares of Acadia (Ticker: ACHC) closed Thursday trading at $17.16 and are up more than 70 percent this year.