COMMON STOCK AND SHARE-BASED COMPENSATION (Performance Shares) (Details) - Performance shares - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Number of Performance Shares
Nonvested (in shares)	1,748,028
Granted (in shares)	763,392
Vested (in shares)	(156,747)
Forfeited (in shares)	(916,582)
Nonvested (in shares)	1,438,091	1,748,028
Weighted Average Grant- Date Fair Value
Nonvested (ins dollars per share)	$ 63.40
Granted (in dollars per share)	36.92	$ 77.00	$ 53.61
Vested (in dollars per share)	56.24
Forfeited (in dollars per share)	53.68
Nonvested (in dollars per share)	$ 56.32	$ 63.40