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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 ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
swap
Aug. 13, 2015
USD ($)
swap
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES                  
Number of swaps terminated | swap 2   1         7  
Termination payments, net of fees $ 1,302,000   $ 684,000         $ 973,000  
Notional amount of terminated swaps 120,000,000   50,000,000            
Reclassification from AOCI to interest expense       $ 0 $ 320,000 $ 1,806,000 $ 320,000    
Write-off from swaps being terminated 1,580,000                
Change in fair value of swaps           209,000 70,000    
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                  
Change in fair value of swaps       $ 0 $ 70,000 $ 209,000 $ 70,000