| http://www.w3.org/ns/prov#value | - During the first quarter of 2013, total operating costs per unit (including lease operating expense, workover and other expense, taxes other than income, and general and administrative expense), after adjusting for selected items (see Selected Operating Data table for additional information), decreased by 35% to $30.71 per Boe, compared to the first quarter of 2012.Floyd C. Wilson, Chairman and Ch
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