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DEBT - Senior Notes (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 26, 2017
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Instrument [Line Items]          
Interest expense   $ 5,882,000 $ 7,020,000 $ 12,154,000 $ 14,110,000
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   $ 4,600,000 $ 4,600,000 $ 9,300,000 $ 9,200,000