Gannett Co. Inc., the media company that owns The Des Moines Register, said today that second-quarter net earnings increased by 78 percent to $208 million, or 90 cents per share, RTTNews reported. The acquisition of Belo Corp. boosted broadcasting revenues. Quarterly revenues rose 12.1 percent to $1.46 billion, from $1.3 billion last year. Publishing revenues declined by 4.1 percent from a year earlier to $867.4 million.