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LONG-TERM DEBT - Schedule Of Cash Flow Hedges Related to Derivative Instruments On the Balance Sheet (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, assets	$ 0		$ 0		$ 820
Cash flow hedge derivatives, liabilities	6,084		6,084		1,942
Unrealized (loss) gain resulting from changes in fair value of derivative instruments	(774)	$ 863	(5,292)	$ 1,503
Other current assets | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, assets	0		0		338
Other non-current assets | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, assets	0		0		482
Other accrued liabilities | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, liabilities	1,686		1,686		387
Other long-term liabilities | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, liabilities	$ 4,398		4,398		1,555
Accumulated other comprehensive loss | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Unrealized (loss) gain resulting from changes in fair value of derivative instruments			(6,459)		(1,196)
Accumulated other comprehensive loss, interest rate swaps, tax provision			(112)		(112)
Accumulated other comprehensive loss			$ (6,571)		$ (1,308)

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