STOCK PLANS - Non-vested Options (Details) - Stock options shares in Thousands	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Number of Options
Nonvested at beginning of year (in shares) | shares	4
Vested (in shares) | shares	(4)
Nonvested at end of year (in shares) | shares	0
Weighted- Average Grant-Date Fair Value
Nonvested at beginning of year (in dollars per share) | $ / shares	$ 6.26
Vested (in dollars per share) | $ / shares	6.26
Nonvested at end of year (in dollars per share) | $ / shares	$ 0.00