SPONSORS AND MANAGEMENT WARRANTS (Details) (USD $)	3 Months Ended		6 Months Ended			1 Months Ended				1 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Nov. 30, 2010 Sponsors Warrants	Jun. 30, 2012 Sponsors Warrants	Dec. 31, 2011 Sponsors Warrants	Nov. 09, 2010 Sponsors Warrants	Feb. 28, 2011 Management Warrants	Jun. 30, 2012 Management Warrants	Dec. 31, 2011 Management Warrants	Feb. 28, 2011 Management Warrants David R. Weinreb	Feb. 28, 2011 Management Warrants Grant Herlitz	Feb. 28, 2011 Management Warrants Andrew C. Richardson
Sponsors and Management Warrants
Issuance of warrants to purchase common stock (in shares)									8,000,000	2,862,687
Estimated initial value									$ 69,500,000
Exercise price (in dollars per share)									$ 50.00				$ 42.23	$ 42.23	$ 54.50
Exercisable (in shares)									6,100,000
Exercisable upon prior notice (in shares)									1,900,000
Notice period to exercise warrants (in days)						90 days
Initial period during which prior notice is to be given for exercise of warrants						6 years 6 months
Proceeds from issuance of warrants				2,000,000						19,000,000
Warrant liabilities	226,185,000		226,185,000		127,764,000		178,400,000	102,600,000			47,800,000	25,200,000
Warrant liability gain (loss)	$ 23,430,000	$ 56,910,000	$ (98,421,000)	$ (69,135,000)