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LONG-TERM DEBT (2013 BofA Real Estate Facility) (Details) - 2013 BofA Real Estate Facility - Bank of America - USD ($)
$ in Millions
Sep. 26, 2013
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 75.0    
Quarterly principal payments as percent of initial amount 1.25%    
Repayment schedule 20 years    
Long-term debt, gross   $ 35.5 $ 40.8
LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.50%    
Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.50%    
Federal Funds      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.50%    
One month LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%