EMPLOYEE BENEFIT PLANS Net Periodic Benefit Cost Not yet Recognized (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Deferred income tax benefit	$ (86,822)	$ 26,692
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(4,527)	(5,707)
Net losses	(150,003)	(52,751)
Negative plan amendment	0	0
Deferred income tax benefit	56,206	21,337
AOCI	(98,324)	(37,121)
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(32)	(262)
Net losses	(11,298)	(7,585)
Negative plan amendment	3,293	3,787
Deferred income tax benefit	2,917	1,482
AOCI	$ (5,120)	$ (2,578)