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EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2019
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         20.00%      
Business Combination, Consideration Transferred       $ 195,000        
Common Stock, Dividends, Per Share, Cash Paid   $ 0.865 $ 0.86   $ 0.795 $ 0.77    
Dividends, Preferred Stock, Cash   $ 300 $ 300          
Preferred Stock, Dividends, Declared   $ 275 $ 275   $ 275 $ 275    
Stock Issued During Period, Shares, New Issues           21,900,000    
Proceeds from Issuance or Sale of Equity           $ 1,200,000    
Aggregate Amount Of Common Shares Available For Issuance And Sale Under Equity Distribution Agreement             $ 1,000,000  
Issued Under Equity Agreement [Member]                
Common Stock Sold Under Equity Distribution Agreement               0
Series E Preferred Stock [Member]                
Preferred Stock, Dividend Rate, Percentage               5.50%
Subsequent Event [Member]                
Common Stock, Dividends, Per Share, Declared $ 0.89              
Dividends Payable, Date of Record Aug. 06, 2019              
Dividends Payable, Date to be Paid Aug. 14, 2019              
Preferred Stock, Dividends, Declared $ 300