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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
derivative_instrument
Sep. 30, 2019
USD ($)
settled_derivative
derivative_instrument
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
settled_derivative
Derivative [Line Items]        
Payment received from derivative settlement   $ 0 $ 16,104  
Derivative liability fair value gross $ 48,788 $ 48,788   $ 16,517
Interest Rate Cap        
Derivative [Line Items]        
Interest rate swap agreements settled | settled_derivative   1    
Interest rate derivatives        
Derivative [Line Items]        
Interest rate swap agreements settled | settled_derivative       4
Reduction in interest expense 1,000 $ 3,000    
Credit Risk Contract        
Derivative [Line Items]        
Derivative liability fair value gross 50,500 50,500   $ 18,200
Designated as Hedging Instrument | Interest Rate Cap        
Derivative [Line Items]        
Notional amount $ 230,000 230,000    
Payment received from derivative settlement   $ 200    
Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Payment received from derivative settlement       15,800
Termination fee       300
Derivatives deferred effective portion of fair value change | derivative_instrument 3 3    
Loss on derivative expected amount to be reclassified $ 5,200 $ 5,200    
Settled Interest Rate Swap, One | Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Notional amount       18,900
Derivative change in fair value recognition period   8 years 3 months 18 days    
Settled Interest Rate Swap, Two | Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Notional amount       250,000
Derivative change in fair value recognition period   2 years    
Settled Interest Rate Swap, Three | Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Notional amount       40,000
Derivative change in fair value recognition period   7 months 6 days    
Settled Interest Rate Swap, Four | Designated as Hedging Instrument | Interest rate derivatives        
Derivative [Line Items]        
Notional amount       $ 119,400