COMMON STOCK AND SHARE-BASED COMPENSATION (Restricted Stock Units) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Restricted Stock Units
Nonvested (in shares)	1,979,812
Granted (in shares)	74,479
Vested (in shares)	(822,249)
Forfeited (in shares)	(191,207)
Nonvested (in shares)	1,040,835	1,979,812
Weighted Average Grant- Date Fair Value
Nonvested (in dollars per share)	$ 47.66
Granted (in dollars per share)	18.57	$ 40.92	$ 66.95
Vested (in dollars per share)	51.01
Forfeited (in dollars per share)	41.49
Nonvested (in dollars per share)	$ 44.06	$ 47.66