EMPLOYEE BENEFIT PLANS Net Periodic Benefit Cost (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,624	$ 2,419
Interest cost	4,683	4,834
Expected return on plan assets	(6,658)	(7,424)
Amortization of prior service cost	292	388
Amortization of losses	2,737	5,727
Amortization of negative plan amendment	0	0
Net periodic benefit cost	2,678	5,944
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	179	249
Interest cost	206	240
Expected return on plan assets	0	0
Amortization of prior service cost	4	6
Amortization of losses	129	218
Amortization of negative plan amendment	(134)	0
Net periodic benefit cost	$ 384	$ 713