Revenues for the year ended December 31, 2015 increased 6.5% to $1,995.0 million from $1,872.8 million for the year ended December 31, 2014. Operating income was $96.7 million, compared to $95.7 million for the prior year. Diluted earnings per share available to common stockholders for the year ended December 31, 2015 was $1.23, compared to $1.32 for the prior year.
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