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LONG-TERM DEBT (2015 Wells Fargo Master Loan Facility) (Details) - 2015 Wells Fargo Master Loan Facility - Wells Fargo
$ in Millions
Feb. 03, 2015
USD ($)
payment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 100.0    
Number of equal monthly principal payments | payment 108    
Amortization schedule 19 years    
Long-term debt, gross   $ 76.8 $ 83.3
LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.85%