LONG-TERM DEBT / INTEREST EXPENSE - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative liability	$ 6,940	$ 3,210
Cumulative unrealized loss, net of tax	4,251	3,259
Interest rate swaps
Derivatives, Fair Value [Line Items]
Cumulative unrealized loss, net of tax	4,800	2,200
Interest rate cash flow hedge gain (loss) to be reclassified	4,000
Other current liabilities | Interest rate swap one
Derivatives, Fair Value [Line Items]
Derivative liability	5,013	0
Other long-term liabilities | Interest rate swap two
Derivatives, Fair Value [Line Items]
Derivative liability	$ 1,927	$ 3,210