SAN FRANCISCO (MarketWatch) -- Dollar Thrifty Auto Group Inc. DTG +11.87% shares rose 12% to $78.01 early Monday after Hertz Global Holdings Inc. HTZ +1.60% offered to buy the car rental company for $2.36 billion in cash and stock. Under the deal, Hertz would pay Dollar Thrifty shareholders $57.60 in cash and 0.8546 shares for each of their shares. Hertz shares added 1.3% to $17.06. Dollar shares have rallied more than 65% since the beginning of the year.