EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS - Employee benefit plan amounts recognized in the Consolidated Balance Sheets and Consolidated Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 1,308	$ 1,175
Interest cost	581	550
Expected return on plan assets	(2,431)	(2,375)
Amortization of prior service cost	(103)	(100)
Defined Benefit Plan, Amortization of Gains (Losses)	420	450
Net periodic benefit cost (income)	$ (225)	$ (300)