EMPLOYEE BENEFIT PLANS Net Periodic Benefit Cost (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,011	$ 2,102	$ 6,441	$ 6,143
Interest cost	3,953	4,321	12,740	12,630
Expected return on plan assets	(5,966)	(6,369)	(19,356)	(18,618)
Amortization of prior service cost	322	327	1,032	956
Amortization of losses	4,792	4,394	15,308	12,846
Net periodic benefit cost	5,112	4,775	16,165	13,957
Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	330	227	828	664
Interest cost	231	242	711	706
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	6	6	19	18
Amortization of losses	98	156	533	455
Net periodic benefit cost	$ 665	$ 631	$ 2,091	$ 1,843