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DEBT - Senior Notes (Details) - USD ($)
3 Months Ended
Sep. 26, 2017
Mar. 31, 2021
Mar. 31, 2020
Debt Instrument [Line Items]      
Interest expense   $ 6,150,000 $ 6,272,000
Senior Notes due 2025      
Debt Instrument [Line Items]      
Notes issued, aggregate principal amount $ 325,000,000    
Notes issued, interest rate 5.50%    
Proceeds from issuance of senior long-term debt $ 318,900,000    
Interest expense   $ 4,500,000 $ 4,600,000