PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Components of expense:
Cost of benefits earned	$ 0	$ 0	$ 0
Interest cost on benefit obligation	2,032	2,171	2,212
Expected return on plan assets	(1,873)	(2,030)	(1,796)
Amortization of prior-service costs	0	0	0
Amortization of transition obligation	0	0	0
Recognized net actuarial loss	316	30	25
Net periodic benefit cost	475	171	441
Other Benefits [Member]
Components of expense:
Cost of benefits earned	195	226	223
Interest cost on benefit obligation	237	292	295
Expected return on plan assets	0	0	0
Amortization of prior-service costs	(233)	(157)	(240)
Amortization of transition obligation	10	20	20
Recognized net actuarial loss	160	122	91
Net periodic benefit cost	$ 369	$ 503	$ 389