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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 1,175	$ 1,007	$ 3,525	$ 3,089
Interest cost	550	551	1,650	1,791
Expected return on plan assets	(2,375)	(2,208)	(7,125)	(6,792)
Amortization of prior service cost	(100)	(103)	(300)	(309)
Defined Benefit Plan, Amortization of Gains (Losses)	450	405	1,350	1,368
Net periodic benefit cost (income)	$ (300)	$ (348)	$ (900)	$ (853)