We believe that the company trades at a significant discount to the sum of its parts. Though the shares trade at slightly less than 7x 2013 EBITDA (a multiple typically associated with its lower multiple businesses), the majority of its profits come from Accommodations, which is a high-growth, high return-on-capital segment that deserves a much higher valuation. At 8.6x 2013 EBITDA, an appropriate multiple given a sum of the parts analysis of OIS’s business mix and where comparable companies trade, OIS would be worth close to $120 per share. We believe that OIS could unlock significant shareholder value by converting the Accommodations unit into a REIT and separating it from the rest of the company; if completed, it would suggest a valuation of $155 per share.
From David Einhorn's 2013 first quarter investor letter.