Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Accounts and rents receivable, allowance	$ 10,783	$ 9,488
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	40,000,000	40,000,000
Preferred stock, shares outstanding
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	1,460,000,000	1,460,000,000
Common stock, shares issued	879,351,306	869,187,360
Common stock, shares outstanding	879,351,306	869,187,360
Additional paid in capital, offering costs	828,434	828,434
Affiliates
Additional paid in capital, offering costs	$ 788,272	$ 788,272