Tumbling crude-oil prices burned up a lot of goodwill. U.S.-listed energy companies slashed the value of certain intangible assets by $18.2 billion in 2015, according to a study by the Financial Executives Research Foundation and Duff & Phelps Corp. That was more than three times as much as the $5.8 billion in write-downs recorded in 2014. The energy sector accounted for 32% of all goodwill impairments.
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