8. RETIREMENT PLANS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Defined Contribution Plan, Company Contribution Percentage	3.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	0.25%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	1.00%
Defined Contribution Plan, Cost Recognized	$ 0.9	$ 1.0	$ 1.0