EMPLOYEE RETIREMENT PLAN (Details)	12 Months Ended
	Dec. 31, 2017
Defined Contribution Plan [Line Items]
Percentage of employer matching contribution	25.00%
Employer matching contribution, percent of employees' gross pay	6.00%
Minimum [Member]
Defined Contribution Plan [Line Items]
Percent of weekly contribution incentive	7.00%
Maximum [Member]
Defined Contribution Plan [Line Items]
Percent of weekly contribution incentive	10.00%
After January 1, 2013 [Member]
Defined Contribution Plan [Line Items]
Percentage of maximum annual employee contribution	100.00%