EMPLOYEE BENEFIT PLANS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Contribution Plan
Defined Contribution Plan 401(k) | $	$ 1.7	$ 2.0	$ 1.4
Multiemployer Pension Plans
Number of multiemployer pension plans	60
Minimum
Multiemployer Pension Plans
Number of union multiemployer pension plans	150