Condensed Consolidated Statements of Equity (Parenthetical) - $ / shares	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Common dividend (in usd per share)	$ 0.17	$ 0.17	$ 0.17	$ 0.16	$ 0.51	$ 0.48	$ 0.64