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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