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DEBT - Old Senior Notes (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 26, 2017
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Instrument [Line Items]          
Interest expense   $ 5,847,000 $ 5,749,000 $ 18,031,000 $ 17,903,000
Senior Notes due 2025 | Old 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 $ 13,500,000 $ 13,900,000
Repayments of long-term debt   $ 10,000,000