QUARTERLY FINANCIAL DATA (UNAUDITED) - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
QUARTERLY FINANCIAL DATA (UNAUDITED)
Asset Impairment Charges	$ 6,800		$ 3,800		$ 14,700	$ 6,600
Operating lease interest expense		$ 1,400	$ 1,400	$ 1,300
Income Tax Expense (Benefit)					$ (124,300)		$ 10,864	$ (135,199)