Equity (Details) (USD $)	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 29, 2012	Mar. 30, 2012
Dividends declared and paid on shares of common stock and noncontrolling common units
Dividend Period	Second Quarter 2012	First Quarter 2012
Amount per Share/Unit	$ 0.21	$ 0.21
Dividends Period Covered	April 1, 2012 to June 30, 2012	January 1, 2012 to March 31, 2012
Dividend Paid Date			Jun. 29, 2012	Mar. 30, 2012