Equity (Details) (USD $)	3 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012
Dividends declared and paid on shares of common stock and noncontrolling common units
Dividend Period	Third Quarter 2012	Second Quarter 2012	First Quarter 2012
Amount per Share/Unit	$ 0.21	$ 0.21	$ 0.21
Dividends Period Covered	July 1, 2012 to September 30, 2012	April 1, 2012 to June 30, 2012	January 1, 2012 to March 31, 2012
Dividend Paid Date				Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012