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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS Common Shares (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) | 2,250,000 | 9,510,000 | 2,250,000 |
Proceeds from Issuance of Common Stock | $ 45.0 |  |  |
Stock Issued During Period, Shares, Conversion of Units |  | 334,000 | 11,000 | 365,000
At The Market Equity Program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Proceeds from Issuance of Common Stock |  | 140.8 |  |
At The Market Equity Program [Member] | Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) |  | 6,100,000 |  |
Public Offering [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Proceeds from Issuance of Common Stock |  | 85.9 |  |
Public Offering [Member] | Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) |  | 3,500,000 |  |
Common Op Units Conversion To Common Shares [Member] | Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, Conversion of Units |  | 250,000 |  |
Restricted Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Restricted Stock, Shares Canceled for Tax Withholding For Share Based Compensation |  | 8,595 |  |
LTIP Units and Restricted Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Allocated Share-based Compensation Expense |  | 3.6 | 4.0 | 3.8

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