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Dividends per Share	12 Months Ended
	Dec. 31, 2016
Dividends per Share [Abstract]
Dividends per Share	21. Dividends per Share Quarterly cash dividends for the years ended December 31, 2015 and 2016 totaled $81.2 million and $78.4 million or $0.35 per share in all quarters of 2015 and $0.355 for all quarters of 2016. The board of directors has declared a quarterly cash dividend of $0.36 per share for all classes of common stock to be paid on March 15, 2017 to stockholders of record on February 27, 2017.

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The entire disclosure for dividends per share.

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