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EMPLOYEE BENEFITS (Investments of the Plan) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets    
Projected benefit obligation $ 46,017 $ 44,755
Accumulated benefit obligation 46,017 44,755
Fair value of plan assets 27,791 25,957
Pension Plans
   
Defined Benefit Plan Disclosure    
Pension plan portfolio assets designed to avoid losses of this percentage in a single year(as a percent) 20.00%  
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets    
Excess of benefit obligation over plan assets (18,225) (18,798)
Unrecognized actuarial loss 24,811 25,192
Net amount recognized 6,586 6,394
Defined Benefit Plan, Amounts Recognized in Balance Sheet    
Accrued benefit liability—noncurrent (18,225) (18,798)
Accumulated other comprehensive income—net actuarial loss 24,811 25,192
Net amount recognized 6,586 6,394
Forest Pension Plan
   
Defined Benefit Plan, Assets, Target Allocations    
Weighted average asset allocations of pension plans (as a percent) 100.00% 100.00%
Wiser Pension Plan
   
Defined Benefit Plan, Assets, Target Allocations    
Weighted average asset allocations of pension plans (as a percent) 100.00% 100.00%
Postretirement Benefits Plan
   
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets    
Excess of benefit obligation over plan assets (17,227) (13,498)
Unrecognized actuarial loss 5,633 3,214
Net amount recognized (11,594) (10,284)
Defined Benefit Plan, Amounts Recognized in Balance Sheet    
Accrued benefit liability—noncurrent (17,227) (13,498)
Accumulated other comprehensive income—net actuarial loss 5,633 3,214
Net amount recognized $ (11,594) $ (10,284)
Fixed Income Funds | Forest Pension Plan
   
Defined Benefit Plan, Assets, Target Allocations    
Weighted average asset allocations of pension plans (as a percent) 24.00% 22.00%
Fixed Income Funds | Wiser Pension Plan
   
Defined Benefit Plan, Assets, Target Allocations    
Weighted average asset allocations of pension plans (as a percent) 25.00% 21.00%
Equity Funds | Pension Plans
   
Defined Benefit Plan Disclosure    
Pension plans target allocation in equity, maximum (as a percent) 75.00%  
Equity Funds | Forest Pension Plan
   
Defined Benefit Plan, Assets, Target Allocations    
Weighted average asset allocations of pension plans (as a percent) 75.00% 76.00%
Equity Funds | Wiser Pension Plan
   
Defined Benefit Plan, Assets, Target Allocations    
Weighted average asset allocations of pension plans (as a percent) 74.00% 78.00%
Oil and gas royalty interests | Forest Pension Plan
   
Defined Benefit Plan, Assets, Target Allocations    
Weighted average asset allocations of pension plans (as a percent) 1.00% 2.00%
Oil and gas royalty interests | Wiser Pension Plan
   
Defined Benefit Plan, Assets, Target Allocations    
Weighted average asset allocations of pension plans (as a percent) 1.00% 1.00%