EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Plan
Plan expense	$ 3.3	$ 3.0	$ 2.5
Maximum
Defined Contribution Plan
Employer matching contribution (as a percent)	6.00%