DEFINED-CONTRIBUTION SAVINGS PLANS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Expense associated with employee contributions	$ 3.5	$ 2.7	$ 2.8
Contributions to employees, Vesting period	4 years