STOCK-BASED COMPENSATION PLANS - Summary of activity of stock options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shares Under Option
Exercised	(34,000)	(31,697)	(102,314)
Stock Options
Shares Under Option
Outstanding at Beginning of Period	72	104	206
Granted
Exercised	(34)	(32)
Forfeited and cancelled
Outstanding at End of Period	38	72	104
Options exercisable at year end	38	72	104
Weighted Average Exercise Price
Outstanding at Beginning of Period	$ 5.49	$ 5.60	$ 5.83
Granted
Exercised	$ 5.49	$ 5.86	$ 6.07
Forfeited and cancelled
Outstanding at End of Period	$ 5.49	$ 5.49	$ 5.60
Options exercisable at year end	$ 5.49	$ 5.49	$ 5.60