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EMPLOYEE BENEFIT PLANS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Amounts recognized in the consolidated balance sheets      
Noncurrent liabilities (included in pension and postretirement liabilities) $ (104,673) $ (106,578)  
Nonunion Defined Benefit Pension Plan
      
Change in benefit obligation      
Benefit obligations at beginning of year 244,402 223,101  
Service cost 9,189 8,655 8,943
Interest cost 8,692 9,954 10,937
Actuarial loss and other 15,893 19,996  
Benefits paid (17,226) (17,304)  
Benefit obligations at end of year 260,950 244,402 223,101
Changes in plan assets      
Fair value of plan assets at beginning of year 161,249 180,351  
Actual return (loss) on plan assets and other 19,202 (1,798)  
Employer contributions 18,000    
Benefits paid (17,226) (17,304)  
Fair value of plan assets at end of year 181,225 161,249 180,351
Funded status (79,725) (83,153)  
Accumulated benefit obligation 230,305 218,636  
Amounts recognized in the consolidated balance sheets      
Noncurrent liabilities (included in pension and postretirement liabilities) (79,725) (83,153)  
Liabilities recognized (79,725) (83,153)  
Components of net periodic benefit cost      
Service cost 9,189 8,655 8,943
Interest cost 8,692 9,954 10,937
Expected return on plan assets (12,063) (12,584) (12,173)
Amortization of prior service credit     (7)
Amortization of net actuarial loss and other 10,767 6,921 7,591
Net periodic benefit cost 16,585 12,946 15,291
Supplemental Benefit Pension Plan
      
Change in benefit obligation      
Benefit obligations at beginning of year 7,620 9,341  
Interest cost 210 386 410
Actuarial loss and other 509 419  
Benefits paid (1,126) (2,526) (8,295)
Benefit obligations at end of year 7,213 7,620 9,341
Changes in plan assets      
Employer contributions 1,126 2,526  
Benefits paid (1,126) (2,526) (8,295)
Funded status (7,213) (7,620)  
Accumulated benefit obligation 7,213 7,620  
Amounts recognized in the consolidated balance sheets      
Current liabilities (included in accrued expenses)   (1,126)  
Noncurrent liabilities (included in pension and postretirement liabilities) (7,213) (6,494)  
Liabilities recognized (7,213) (7,620)  
Components of net periodic benefit cost      
Interest cost 210 386 410
Pension settlement expense   1,125 178
Amortization of net actuarial loss and other 202 328 279
Net periodic benefit cost 412 1,839 867
Postretirement Health Benefit Plan
      
Change in benefit obligation      
Benefit obligations at beginning of year 17,553 13,930  
Service cost 315 224 140
Interest cost 749 781 870
Actuarial loss and other 277 3,185  
Benefits paid (586) (567)  
Benefit obligations at end of year 18,308 17,553 13,930
Changes in plan assets      
Employer contributions 586 567  
Benefits paid (586) (567)  
Funded status (18,308) (17,553)  
Accumulated benefit obligation 18,308 17,553  
Amounts recognized in the consolidated balance sheets      
Current liabilities (included in accrued expenses) (573) (622)  
Noncurrent liabilities (included in pension and postretirement liabilities) (17,735) (16,931)  
Liabilities recognized (18,308) (17,553)  
Components of net periodic benefit cost      
Service cost 315 224 140
Interest cost 749 781 870
Amortization of transition obligation     135
Amortization of prior service credit (190) (190)  
Amortization of net actuarial loss and other 416 112 18
Net periodic benefit cost $ 1,290 $ 927 $ 1,163