| http://www.w3.org/ns/prov#value | - During the second quarter of 2013, total operating costs per unit (including lease operating expense, workover and other expense, taxes other than income, gathering and other and general and administrative expense), after adjusting for selected items (see Selected Operating Data table for additional information), decreased by 42% to $31.07 per Boe, compared to the second quarter of 2012.
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