STOCK BASED COMPENSATION PLANS - Nonvested Shares Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Stock
Number of Shares Nonvested Other than Options [Roll Forward]
Nonvested/Outstanding (in shares)	1,475,865	1,334,369
Granted (in shares)	2,012,154	960,531
Vested (in shares)	(2,225,654)	(770,568)
Forfeited (in shares)	(10,000)	(48,467)
Nonvested/Outstanding (in shares)	1,252,365	1,475,865	1,334,369
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Nonvested/Outstanding (in shares)	982,135	601,186
Granted (in shares)	0	380,949	670,256
Exercised (in shares)	0	0
Forfeited (in shares)	0	0
Expired (in shares)	0	0
Nonvested/Outstanding (in shares)	982,135	982,135	601,186
Exercisable (in shares)	752,017	230,936
LP Units
Number of Shares Nonvested Other than Options [Roll Forward]
Nonvested/Outstanding (in shares)	0	504
Granted (in shares)		0
Vested (in shares)		(504)
Forfeited (in shares)		0
Nonvested/Outstanding (in shares)		0	504