LONG-TERM DEBT - Components of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Borrowings [Abstract]
Total Debt	$ 330,000
Less: Current maturities	(3,300)	$ (2,500)
Unamortized debt issuance costs	9,600	6,500
Carrying Value
Borrowings [Abstract]
Total Debt	330,000	244,375
Less: Current maturities	(3,300)	(2,500)
Total Long-term Debt	326,700	241,875
Carrying Value | ABL Revolver
Borrowings [Abstract]
Total Debt	0	0
Carrying Value | Term Loan B
Borrowings [Abstract]
Total Debt	330,000	244,375
Fair Value
Borrowings [Abstract]
Total Debt	325,875	244,375
Less: Current maturities	(3,259)	(2,500)
Total Long-term Debt	322,616	241,875
Fair Value | ABL Revolver
Borrowings [Abstract]
Total Debt	0	0
Fair Value | Term Loan B
Borrowings [Abstract]
Total Debt	$ 325,875	$ 244,375