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