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CAPITAL STOCK - Schedule of Preferred Stock (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Class of Stock [Line Items]      
Shares Authorized (in shares) 85,150,000   85,150,000
Shares Issued (in shares) 81,900,000   81,900,000
Shares Outstanding (in shares) 81,900,000   81,900,000
Carrying Value $ 1,982,026   $ 1,982,026 [1]
Series D      
Class of Stock [Line Items]      
Shares Authorized (in shares) 18,400,000   18,400,000
Shares Issued (in shares) 18,400,000   18,400,000
Shares Outstanding (in shares) 18,400,000   18,400,000
Carrying Value $ 445,457   $ 445,457
Contractual Rate 7.50%    
Series F      
Class of Stock [Line Items]      
Shares Authorized (in shares) 28,800,000   28,800,000
Shares Issued (in shares) 28,800,000   28,800,000
Shares Outstanding (in shares) 28,800,000   28,800,000
Carrying Value $ 696,910   $ 696,910
Contractual Rate 6.95%    
Floating annual rate 4.993%    
Series G      
Class of Stock [Line Items]      
Shares Authorized (in shares) 19,550,000   19,550,000
Shares Issued (in shares) 17,000,000   17,000,000
Shares Outstanding (in shares) 17,000,000   17,000,000
Carrying Value $ 411,335   $ 411,335
Contractual Rate 6.50%    
Floating annual rate 4.172%    
Series I      
Class of Stock [Line Items]      
Shares Authorized (in shares) 18,400,000   18,400,000
Shares Issued (in shares) 17,700,000 16,000,000.0 17,700,000
Shares Outstanding (in shares) 17,700,000   17,700,000
Carrying Value $ 428,324   $ 428,324
Contractual Rate 6.75% 6.75%  
Floating annual rate 4.989%    
[1]
Derived from the audited consolidated financial statements at December 31, 2019.