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SHAREHOLDERS’ EQUITY (Details) - USD ($)
12 Months Ended
Dec. 05, 2017
Dec. 07, 2016
Apr. 30, 2018
Apr. 30, 2017
Class of Stock [Line Items]        
Noncontrolling interests - Operating Partnership (in shares)     14,099,434 15,617,216
Conversion of Units to Common Shares. [Abstract]        
Units converted to common stock (in shares)     1,500,000 165,000
Units converted to common stock     $ 8,800,000 $ 966,000
Units converted to common stock, unit price (in dollars per share)     $ 5.89 $ 5.84
Equity Awards        
Common shares outstanding (in shares)     119,525,975 121,199,299
Share Repurchase Program [Member]        
Share Repurchase Program        
Authorized share repurchase amount   $ 50,000,000    
Repurchase period 1 year 1 year    
Shares repurchased and retired (in shares)     1,800,000 778,000
Shares repurchased and retired     $ 9,900,000 $ 4,500,000
Share price (in dollars per share)     $ 5.56 $ 5.77
2015 Incentive Plan [Member]        
Equity Awards        
Forfeited (in shares)     32,000 274,000
2015 Incentive Plan [Member] | Performance Shares [Member]        
Equity Awards        
Issued (in shares)     93,000 604,000
Grant-date value     $ 536,000 $ 2,600,000
2008 Incentive Award Plan [Member] | Performance Shares [Member]        
Equity Awards        
Issued (in shares)       59,000
Grant-date value       $ 352,000
Series C Preferred Stock [Member]        
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract]        
Preferred shares issued (in shares)     4,118,460 0
Distribution rate percentage     6.625%  
Series B Preferred Stock [Member]        
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract]        
Preferred shares issued (in shares)     0 4,600,000
Distribution rate percentage     7.95%  
Shares redeemed (in shares)     4,600,000  
Series A Preferred Stock [Member]        
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract]        
Distribution rate percentage       8.25%
Aggregate redemption price       $ 29,200,000
Exercise of Exchange Rights [Member]        
Conversion of Units to Common Shares. [Abstract]        
Units converted to common stock (in shares)       503,000
Units converted to common stock       $ 875,000