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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 11, 2019
USD ($)
swap
Feb. 28, 2019
USD ($)
Dec. 28, 2018
USD ($)
swap
Mar. 31, 2020
USD ($)
Mar. 31, 2019
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  
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 $ 1,806,000    
Write-off from swaps being terminated 1,580,000            
Change in fair value of 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         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         $ (209,000)