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EMPLOYEE RETIREMENT PLANS (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in projected benefit obligation      
Service cost $ 1,472 $ 1,212 $ 1,187
Interest cost 2,317 2,373 2,449
Change in plan assets      
Fair value of plan assets, beginning of year 26,655 26,193  
Fair value of plan assets, end of year 27,819 26,655 26,193
Amounts recognized in the consolidated balance sheets consist of:      
Long-term pension liability (27,530) (26,344)  
Pension Plans, Defined Benefit [Member]
      
Change in projected benefit obligation      
Projected benefit obligation, beginning of year 39,523 34,407  
Service cost 1,236 977  
Interest cost 1,800 1,807  
Plan amendments 0 0  
Actuarial loss (gain) 2,532 3,776  
Benefits paid (1,639) (1,444)  
Projected benefit obligation, end of year 43,452 39,523  
Change in plan assets      
Fair value of plan assets, beginning of year 26,655 26,193  
Actual return on plan assets 2,932 400  
Administrative expenses (129) (94)  
Contributions 0 1,600  
Benefits paid (1,639) (1,444)  
Fair value of plan assets, end of year 27,819 26,655  
Funded status of plan (15,633) (12,868)  
Amounts recognized in the consolidated balance sheets consist of:      
Accrued liabilities - other 0 0  
Long-term pension liability (15,633) (12,868)  
Net amount recognized (15,633) (12,868)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Accumulated loss, net of income tax benefit of $6,735, $6,575, $2,102 and $2,487, respectively 10,534 10,283  
Prior service cost, net of income tax benefit of $1, $1, ($402) and $106, respectively 1 2  
Net amount recognized 10,535 10,285  
Supplemental Employee Retirement Plans, Defined Benefit [Member]
      
Change in projected benefit obligation      
Projected benefit obligation, beginning of year 13,870 10,754  
Service cost 236 235  
Interest cost 516 566  
Plan amendments (1,415) 0  
Actuarial loss (gain) (576) 2,494  
Benefits paid (361) (179)  
Projected benefit obligation, end of year 12,270 13,870  
Change in plan assets      
Fair value of plan assets, beginning of year 0 0  
Actual return on plan assets 0 0  
Administrative expenses 0 0  
Contributions 361 179  
Benefits paid (361) (179)  
Fair value of plan assets, end of year 0 0  
Funded status of plan (12,270) (13,870)  
Amounts recognized in the consolidated balance sheets consist of:      
Accrued liabilities - other (373) (394)  
Long-term pension liability (11,897) (13,476)  
Net amount recognized (12,270) (13,870)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Accumulated loss, net of income tax benefit of $6,735, $6,575, $2,102 and $2,487, respectively 3,288 3,891  
Prior service cost, net of income tax benefit of $1, $1, ($402) and $106, respectively (628) 166  
Net amount recognized $ 2,660 $ 4,057