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LONG-TERM DEBT - Senior Notes Narrative (Details) - USD ($)		3 Months Ended	12 Months Ended
	Sep. 26, 2017	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Interest expense			$ 24,194,000	$ 27,340,000	$ 28,759,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 325,000,000
Notes issued, interest rate	5.50%
Proceeds from issuance of senior long-term debt	$ 318,900,000
Debt instrument, redemption price, percentage			101.00%
Debt instrument, redemption price, percentage of principal amount outstanding			60.00%
Interest expense			$ 18,600,000	$ 18,500,000	$ 18,500,000
Repayments of long-term debt		$ 10,000,000.0
Senior Notes | Prior to October 1, 2020
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Debt instrument, redemption price, percentage of principal amount redeemed, threshold			40.00%
Debt instrument, redemption price, percentage for first threshold			105.50%
Senior Notes | Twelve-month period beginning October 1, 2020
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			102.75%
Senior Notes | Twelve-month period beginning October 1, 2021
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			101.375%
Senior Notes | Twelve-month period beginning on October 1, 2022
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%

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Face (par) amount of debt instrument at time of issuance.

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