SHAREHOLDERS' EQUITY - (Summary of Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, end of period (in dollars per share)	$ 3.72
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	79,484	174,633	219,285
Granted (in shares)	0	0	0
Exercised (in shares)	(29,133)	(94,249)	(44,652)
Cancelled (in shares)	0	(900)	0
Outstanding, end of period (in shares)	50,351	79,484	174,633
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning of period (in dollars per share)	$ 3.70	$ 3.79	$ 3.79
Weighted Average Option Exercise Price, Granted (in dollars per share)	0.00	0.00	0.00
Weighted Average Option Exercise Price, Exercised (in dollars per share)	3.68	3.85	3.81
Weighted Average Option Exercise Price, Cancelled (in dollars per share)	0.00	4.40	0.00
Outstanding, end of period (in dollars per share)	$ 3.72	$ 3.70	$ 3.79