Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Additional Information (Details)

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2015
Jan. 31, 2020
Derivative                
Net unrealized gains (losses) arising during the period $ (1,357) $ 2,290 $ (2,275) $ 1,548        
Reclassification adjustments increased interest expense on a net basis (1,115) (125) (1,061) (1,652)        
Treasury lock | Portion of senior notes                
Derivative                
Reclassification adjustments increased interest expense on a net basis 300 $ 100 600 $ 200        
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts | Treasury lock                
Derivative                
Net unrealized gains (losses) arising during the period           $ (13,600) $ 7,500  
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts | Treasury lock | 2020 Rate Lock Agreements                
Derivative                
Derivative, notional amount               $ 350,000
Net unrealized gains (losses) arising during the period         $ (21,500)      
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts | Treasury lock | Portion of senior notes                
Derivative                
Unamortized portion of the fair value of derivative contracts $ 29,600   $ 29,600          
Maximum | Derivatives designated as hedging instruments | Cash flow hedge contracts | Treasury lock                
Derivative                
Term of contract     18 months