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SHARE INCENTIVE PLAN Share Incentive Plan (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Trustee [Member] | Mar. 15, 2012 Officer [Member] | Dec. 31, 2012 2006 Plan [Member] | Mar. 15, 2012 LTIP Units [Member] Officer [Member] | May 10, 2012 Restricted Stock [Member] Trustee [Member] | Mar. 15, 2012 Restricted Stock [Member] Officer [Member] | Mar. 15, 2012 Restricted Stock [Member] Other Employees [Member] | Dec. 31, 2009 Long Term Investment Alignment Program [Member] Senior Executives [Member] | Dec. 31, 2012 Long Term Investment Alignment Program [Member] Senior Executives [Member] | Dec. 31, 2012 LTIP Units and Restricted Stock [Member] | Dec. 31, 2011 LTIP Units and Restricted Stock [Member] | Dec. 31, 2010 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 |  |  |  |  |  |  | 279,611 | 19,360 | 1,358 | 9,435 |  |  |  |  |
Percent of Awards Issued to Officers Subject to Performance Measures |  |  |  |  | 17.00% |  |  |  |  |  |  |  |  |  |
Total Value of Restricted Shares and LTIP Units as of the Grant Date |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,400,000 |  |
Share compensation expense | 4,021,000 | 4,299,000 | 4,104,000 |  |  |  |  |  |  |  |  |  |  | 2,600,000 |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | 9,600,000 |  |  |  |  |  |  |  |  |  |  |  | 3,800,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.98 | $ 19.08 | $ 16.73
Long Term Incentive and Share Based Compensation Expense |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 | 4,000,000 | 3,800,000
Shares Granted to Trustees for Trustee Fees Vesting on One Year Anniversary of Grant Date |  |  |  |  |  |  |  | 8,983 |  |  |  |  |  |  |
Shares Granted to Trustees for Trustee Fees Begin Vesting on Two Year Anniversary of Grant Date |  |  |  |  |  |  |  | 10,377 |  |  |  |  |  |  |
Annual Vesting Rate of Shares Granted to Trustees That Begin Vesting on the Second Anniversary of Grant Date |  |  |  |  |  |  |  | 33.00% |  |  |  |  |  |  |
Trustee Fees | $ 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Max Percentage of Future Fund III Promote That May be Awarded to Senior Executives |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |
Percent of Units Awarded |  |  |  |  |  |  |  |  |  |  |  | 81.00% |  |  |
Options Outstanding and Vested to Officers and Employees | 100,647 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options Outstanding and Vested to Non Employee Turstees |  |  |  | 37,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition Maximum Percentage of Promote To Be Awarded as Share Based Compensation Awards. Promote is defined as the amount above a certain performance measurement threshold. + References No definition available. + Details
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- Definition Percent of Awards Issued to Officers Subject to Performance Measures + References No definition available. + Details
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- Definition Share-based Compensation, Granted, for Service, Vesting Rate Beginning on the First Anniversary of Grant Date + References No definition available. + Details
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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Value of stock (or other type of equity) granted during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. This element is not the recognition of equity-based compensation expense in pursuant to FAS 123R. That element is AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue (Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 30 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6743629&loc=d3e3913-113898 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 30 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418191&loc=d3e15009-113911 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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