EMPLOYEE BENEFITS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined Benefit Plan, Contributions by Employer	$ 1,700		$ 2,100
Service cost	2,532	$ 2,252	5,064	$ 4,503
Interest cost	2,412	2,637	4,824	5,274
Expected return on assets	(2,594)	(2,060)	(5,188)	(4,119)
Amortization of transition asset	0	(35)	0	(71)
Amortization of unrecognized losses	378	195	756	390
Amortization of prior service credits	(1,700)	(1,814)	(3,400)	(3,627)
Net periodic benefit costs	$ 1,028	$ 1,175	$ 2,056	$ 2,350