Read MoreThe Texas-based company reports profits of $1.1bn in the first quarter, down from $2.51bn a year ago.The Texas-based company reports profits of $1.1bn in the first quarter, down from $2.51bn a year ago.

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Read MoreThe Texas-based company reports profits of $1.1bn in the first quarter, down from $2.51bn a year ago.The Texas-based company reports profits of $1.1bn in the first quarter, down from $2.51bn a year ago.