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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2018 USD ($) shares $ / shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2019 USD ($)
Derivative [Line Items]
Proceeds from sale of warrants		$ 0	$ 18,147	$ 0
Designated as Hedging Instrument
Derivative [Line Items]
Payments for derivative instrument	$ 31,500
Proceeds from sale of warrants	$ 18,100
Designated as Hedging Instrument \| Interest rate swap agreements
Derivative [Line Items]
Derivative amount					$ 200,000
Convertible Senior Notes Due 2023
Derivative [Line Items]
Number of equity instruments \| shares	1,962,790
Exercise price of warrants or rights (in USD per share) \| $ / shares	$ 113.93