CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Dividends paid to public stockholders (per share)	$ 0.693	$ 0.627	$ 0.573
Dividends paid to affiliate (per share)	$ 0.693	$ 0.627	$ 0.573