Kirby Corporation announced record net earnings attributable to Kirby for the first quarter ended March 31, 2012 of $50.9 million, or $.91 per share, compared with $32.4 million, or $.60 per share, for the 2011 first quarter. Consolidated revenues for the 2012 first quarter were $566.9 million compared with $299.4 million reported for the 2011 first quarter. Kirby's 2012 first quarter results included a $4.2 million before taxes, or $.05 per share, charge associated with increasing the fair value of the United Holdings LLC ("United") contingent earnout liability…