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Dividends per Share	12 Months Ended
	Dec. 31, 2017
Dividends per Share [Abstract]
Dividends per Share	22. Dividends per Share Quarterly cash dividends for the years ended December 31, 2016 and 2017 totaled $78.4 million and $76.1 million or $0.355 per share in all quarters of 2016 and $0.36 for all quarters of 2017. The board of directors has declared a quarterly cash dividend of $0.365 per share of Class A common stock to be paid on March 14, 2018 to stockholders of record on February 26, 2018.

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The entire disclosure for dividends per share.

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