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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS Common Shares (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) | 1,973,000 | 12,237,000 | 3,013,000
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares) | 101,000 | 136,000 | 93,000
ATM Equity Program [Member] |  |  |
Class of Stock [Line Items] |  |  |
Proceeds from issuance of common stock | $ 64.4 | $ 127.1 |
ATM Equity Program [Member] | Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) | 2,000,000 | 4,700,000 | 3,000,000
Proceeds from issuance of common stock |  |  | $ 80.7
Public Offering [Member] |  |  |
Class of Stock [Line Items] |  |  |
Proceeds from issuance of common stock |  | $ 230.7 |
Public Offering [Member] | Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) |  | 7,600,000 |
Common Op Units Conversion To Common Shares [Member] | Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares) |  | 1,600,000 | 1,200,000
Restricted Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Restricted stock, shares canceled for tax withholding for share based compensation | 2,481 |  |
LTIP Units and Restricted Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Unit based compensation | $ 6.8 |  |

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