GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangible Assets [Line Items]
Intangible assets, net	$ 357,014	$ 382,982	$ 263,467
Amortization of intangible assets	35,908	$ 34,213	$ 19,374
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2020	38,208
2021	37,669
2022	36,844
2023	35,640
2024	$ 34,045
Non-compete agreements
Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	5 years	4 years 10 months 24 days
Customer relationships
Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	10 years 1 month 6 days	10 years 1 month 6 days
Aluminum Metals Company | Non-compete agreements
Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	3 years
Acquired Entities | Customer relationships
Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	10 years
Trademarks
Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross	$ 88,524	$ 82,358