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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 11, 2019
USD ($)
swap
Feb. 28, 2019
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Dec. 28, 2018
USD ($)
swap
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
swap
Dec. 31, 2017
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swap
Aug. 13, 2015
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swap
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES                
Number of interest rate swaps terminated | swap 2   1     2 7  
Notional amount of terminated swaps $ 120,000,000   $ 50,000,000       $ 215,000,000  
Termination payments, net of fees 1,302,000   684,000       973,000  
Reclassification from AOCI to interest expense       $ 0 $ 0 $ 1,806,000    
Write-off from interest rate swaps being terminated           1,580,000    
Loss in fair value of interest rate swaps         $ 0 (209,000)    
Unsecured Term Loan Facility Entered Into May 2015                
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES                
Repayments of debt             $ 215,000,000  
Interest Rate Swap                
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES                
Number of interest rate swaps | swap               10
Total notional amount               $ 385,000,000
Derivative, fair value 1,421,000              
Loss on swap       0   119,000    
Revolving Credit Facility | Line of Credit                
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES                
Repayments of debt $ 120,000,000 $ 10,000,000 $ 40,000,000          
Interest Expense                
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES                
Loss in fair value of interest rate swaps       $ 0   $ 209,000