EMPLOYEE BENEFIT PLANS Net Periodic Benefit Cost (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,544	$ 2,011	$ 3,168	$ 4,430
Interest cost	4,452	3,953	9,135	8,787
Expected return on plan assets	(6,330)	(5,966)	(12,988)	(13,390)
Amortization of prior service cost	277	322	569	710
Amortization of losses	2,603	4,791	5,340	10,516
Amortization of negative plan amendment	0	0	0	0
Net periodic benefit cost	2,546	5,111	5,224	11,053
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	147	249	326	498
Interest cost	199	240	405	480
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	4	6	8	13
Amortization of losses	116	218	245	436
Amortization of negative plan amendment	(133)	0	(267)	0
Net periodic benefit cost	$ 333	$ 713	$ 717	$ 1,427