EMPLOYEE BENEFITS (Expected Benefit Payments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Estimated Future Benefit Payments
Anticipated contributions in 2013	$ 1,000,000
Pension Plans
Defined Benefit Plan, Estimated Future Benefit Payments
Anticipated contributions in 2013	1,600,000
Defined Benefit Plan, Change in Benefit Obligation
Benefit obligation at the beginning of the year	44,755,000		42,213,000
Service cost	0		0	0
Interest cost	1,554,000		1,836,000	2,005,000
Actuarial loss	2,902,000		3,931,000
Benefits paid	(3,194,000)		(3,225,000)
Retiree contributions	0		0
Benefit obligation at the end of the year	46,017,000		44,755,000	42,213,000
Forest Pension Plan
Defined Benefit Plan, Estimated Future Benefit Payments
2013	2,399,000	[1]
2014	2,318,000	[1]
2015	2,267,000	[1]
2016	2,196,000	[1]
2017	2,145,000	[1]
2018-2022	9,770,000	[1]
Wiser Pension Plan
Defined Benefit Plan, Estimated Future Benefit Payments
2013	852,000	[1]
2014	840,000	[1]
2015	829,000	[1]
2016	820,000	[1]
2017	809,000	[1]
2018-2022	3,845,000	[1]
SERP
Defined Benefit Plan, Estimated Future Benefit Payments
2013	130,000
2014	127,000
2015	123,000
2016	119,000
2017	114,000
2018-2022	496,000
Postretirement Benefits Plan
Defined Benefit Plan, Estimated Future Benefit Payments
2013	710,000
2014	704,000
2015	684,000
2016	659,000
2017	675,000
2018-2022	3,607,000
Anticipated contributions in 2013	600,000
Defined Benefit Plan, Change in Benefit Obligation
Benefit obligation at the beginning of the year	13,498,000		9,212,000
Service cost	1,131,000		825,000	668,000
Interest cost	547,000		529,000	430,000
Actuarial loss	2,613,000		3,645,000
Benefits paid	(619,000)		(779,000)
Retiree contributions	57,000		66,000
Benefit obligation at the end of the year	$ 17,227,000		$ 13,498,000	$ 9,212,000

[1] Benefit payments expected to be made to participants in the Forest Pension Plan and Wiser Pension Plan are expected to be paid out of funds held in trusts established for each plan.