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LONG-TERM DEBT - Senior Notes Narrative (Details) - USD ($)		12 Months Ended
	Sep. 26, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 27, 2017
Debt Instrument [Line Items]
Interest expense		$ 28,759,000	$ 16,400,000	$ 15,663,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 325,000,000				$ 325,000,000
Notes issued, interest rate	5.50%				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		$ 18,500,000	$ 4,800,000
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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Contractual interest rate for funds borrowed, under the debt agreement.

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