Consolidated Statements of Equity (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Stockholders' Equity [Abstract]
Cash distribution declared, per common share (usd per share)	$ 0.50	$ 0.33	$ 1.00	$ 0.66