CONSOLIDATED STATEMENTS OF EQUITY (parenthetical) - $ / shares			12 Months Ended
	Nov. 12, 2015	Oct. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Dividends declared for common stock (in dollars per share)	$ 2.00	$ 2.00	$ 2.87	$ 2.75	$ 6.63