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DEBT - Additional Details (Details)
3 Months Ended 12 Months Ended
Mar. 01, 2019
USD ($)
Mar. 31, 2020
USD ($)
subsidiary_trust
Mar. 31, 2019
USD ($)
Dec. 16, 2003
USD ($)
subsidiary_trust
Dec. 31, 2019
USD ($)
Oct. 12, 2017
USD ($)
Jul. 31, 2016
USD ($)
Oct. 15, 2015
USD ($)
Jan. 05, 2015
USD ($)
Debt Instrument [Line Items]                  
Number of subsidiary trusts | subsidiary_trust   6   6          
Membership interest 1.25%                
Long-term debt, fair value   $ 250,969,000     $ 266,642,000        
Carrying value   242,532,000     258,529,000        
Gain (loss) included in earnings   (14,300,000)              
Gain on change in fair value of debt   2,645,000 $ 576,000            
Change in fair value of debt attributable to instrument-specific credit risk [1]   11,623,000 $ (945,000)            
Interest expense on trust preferred securities   10,400,000              
Bank loans                  
Debt Instrument [Line Items]                  
Long-term debt, fair value   10,966,000     12,255,000        
Carrying value   8,727,000     9,240,000        
Notes payable                  
Debt Instrument [Line Items]                  
Long-term debt, fair value   199,616,000     199,732,000        
Carrying value   193,418,000     194,634,000        
Mortgage                  
Debt Instrument [Line Items]                  
Debt face amount             $ 180,000,000    
Interest rate             4.07%    
Long-term debt, fair value   182,941,000     182,265,000   $ 191,700,000    
Unamortized premium             $ 11,700,000    
Carrying value   177,192,000     178,297,000        
PWSC Loan | Bank loans                  
Debt Instrument [Line Items]                  
Debt face amount           $ 5,000,000.0      
Interest rate           5.00%      
Long-term debt, fair value   0     435,000        
Carrying value   0     437,000        
KWH Loan | Bank loans                  
Debt Instrument [Line Items]                  
Debt face amount $ 10,000,000.0                
Proceeds from issuance of debt 400,000                
Unamortized discount (premium), net $ 1,000,000                
Long-term debt, fair value   10,966,000     11,820,000        
Carrying value   8,727,000     8,803,000        
KWH Loan | LIBOR | Bank loans                  
Debt Instrument [Line Items]                  
Annual interest rate 9.25%                
Flower Note | Notes payable                  
Debt Instrument [Line Items]                  
Debt face amount                 $ 9,200,000
Interest rate                 4.81%
Long-term debt, fair value   7,890,000     8,071,000        
Carrying value   7,226,000     7,337,000        
Net Lease Note | Notes payable                  
Debt Instrument [Line Items]                  
Debt face amount               $ 9,000,000  
Interest rate               10.25%  
Long-term debt, fair value   8,785,000     9,396,000        
Carrying value   $ 9,000,000     $ 9,000,000        
30-Year Capital Securities                  
Debt Instrument [Line Items]                  
Debt face amount       $ 90,500,000          
Minimum | LIBOR                  
Debt Instrument [Line Items]                  
Annual interest rate       3.85%          
Minimum | KWH Loan | LIBOR | Bank loans                  
Debt Instrument [Line Items]                  
Annual interest rate 2.00%                
Maximum | LIBOR                  
Debt Instrument [Line Items]                  
Annual interest rate       4.20%          
[1] Net of income tax expense (benefit) of $0 and $0 for the three months ended March 31, 2020 and March 31, 2019, respectively.