Travel website owner Priceline Group Inc will buy restaurant reservation website operator OpenTable Inc for $2.6 billion, aiming to broaden its services outside the increasingly competitive online travel industry. Priceline's offer of $103 per share for the owner of OpenTable.com represents a premium of 46 percent to OpenTable's Thursday close. OpenTable's shares inched past the offer price to trade as high as $104.19 on the Nasdaq, suggesting that some investors expect a higher bid. Priceline's shares were down 1.6 percent at $1,205.50. Priceline, whose competitors include Expedia Inc and Orbitz Worldwide Inc, has a record of buying smaller companies and transforming them into large, successful businesses. With little room to expand, online travel companies are looking outside the industry to boost revenue and drive more customers to their websites by offering more of a one-stop shop for travelers by offering services at their destination. TripAdvisor Inc, for