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EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL - Common and Preferred Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands
 12 Months Ended
Nov. 02, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Issuance of Common and Preferred Shares        
Series A Cumulative Redeemable Preferred, redeemed     $ 77,574,000  
Net proceeds from sale of common shares   $ 29,642,000 $ 136,121,000 $ 234,061,000
Equity Distribution Agreements | Maximum        
Issuance of Common and Preferred Shares        
Number of shares that may be sold   40,000    
Common Shares | Equity Distribution Agreements        
Issuance of Common and Preferred Shares        
Number of common stock sold (in shares)   1,036 4,408 8,977
Average sales price per common share (in dollars per share)   $ 29.13 $ 31.25 $ 26.35
Net proceeds from sale of common shares   $ 29,642,000 $ 136,120,000 $ 234,240,000
Common shares remained available for issuance   4,700 5,800 10,200
Series A        
Issuance of Common and Preferred Shares        
Series A Cumulative Redeemable Preferred, shares redeemed 3,100      
Series A Cumulative Redeemable Preferred shares, percentage 7.75%      
Series A Cumulative Redeemable Preferred, redeemed $ 77,500,000      
Series A Cumulative Redeemable Preferred shares, redemption price (in dollars per share) $ 25.00      
Series A Cumulative Redeemable Preferred shares, dividend (in dollars per share) $ 0.17374      
Series A Preferred shares, percentage 7.75%