Billionaire hedge fund manager Leon Cooperman, one of this generation's most successful and highly watched investors, is closing his hedge fund Omega Advisors after 27-years and will convert it to a family office. Cooperman, 75, characterized the move as returning client money at a high after a run of strong performance, and citeda famous line in Kenny Rogers' classic ballad The Gambler, "You've got to know when to hold 'em, know when to fold 'em."