SHARE INCENTIVE PLAN Share Incentive Plan (Details) (USD $)	12 Months Ended					12 Months Ended	0 Months Ended				3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Trustee [Member]	Feb. 22, 2013 Officer [Member]	Dec. 31, 2013 2006 Plan [Member]	Feb. 22, 2013 LTIP Units [Member] Officer [Member]	May 15, 2013 Restricted Stock [Member] Trustee [Member]	Feb. 22, 2013 Restricted Stock [Member] Officer [Member]	Feb. 22, 2013 Restricted Stock [Member] Other Employees [Member]	Mar. 31, 2010 Long Term Investment Alignment Program [Member] Senior Executives [Member]	Dec. 31, 2013 LTIP Units and Restricted Stock [Member]	Dec. 31, 2012 LTIP Units and Restricted Stock [Member]	Dec. 31, 2011 LTIP Units and Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Increase in Number of Shares Authorized						1,900,000
Maximum Equivalent Value of Common Shares a Participant Can be Awarded						2,100,000
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures							284,447	20,718	590	11,880
Percent of Awards Issued to Officers Subject to Performance Measures					16.00%
Total Value of Restricted Shares and LTIP Units as of the Grant Date														$ 7,900,000
Share compensation expense	7,667,000	3,350,000	3,682,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	11,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value												$ 26.40	$ 22.31	$ 19.08
Long Term Incentive and Share Based Compensation Expense												7,300,000	3,600,000	4,000,000
Shares Granted to Trustees for Trustee Fees Vesting on One Year Anniversary of Grant Date								10,950
Shares Granted to Trustees for Trustee Fees Begin Vesting on Two Year Anniversary of Grant Date								9,768
Annual Vesting Rate of Shares Granted to Trustees That Begin Vesting on the Second Anniversary of Grant Date								33.00%
Trustee Fees	$ 0.3
Max Percentage of Future Fund III Promote That May be Awarded to Senior Executives											25.00%
Options Outstanding and Vested to Officers and Employees	92,086
Options Outstanding and Vested to Non Employee Trustees				21,000