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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Pension Plan Assets by Level with the Fair Value Hierarchy) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value $ 813,897 $ 749,456 $ 726,474
Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 112,933 95,989  
Significant Other Observable Inputs (Level 2)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 673,881 635,020  
Significant Unobservable Inputs (Level 3)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 27,083 18,447  
Corporate stock
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 107,763 [1] 94,407 [1]  
Corporate stock | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 107,763 94,407  
Corporate stock | Significant Other Observable Inputs (Level 2)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 0 0  
Corporate stock | Significant Unobservable Inputs (Level 3)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 0 0  
Cash and cash equivalents
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 5,170 1,582  
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 5,170 1,582  
Cash and cash equivalents | Significant Other Observable Inputs (Level 2)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 0 0  
Cash and cash equivalents | Significant Unobservable Inputs (Level 3)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 0 0  
Insurance company nonpooled separate account | Significant Unobservable Inputs (Level 3)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 0 650  
Cash and Cash Equivalents
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value   15,371 [2]  
Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value   0 [2]  
Cash and Cash Equivalents | Significant Other Observable Inputs (Level 2)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value   15,371 [2]  
Cash and Cash Equivalents | Significant Unobservable Inputs (Level 3)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value   0 [2]  
Corporate and other obligations
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 412 [3] 8,938 [2]  
Corporate and other obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 0 0 [2]  
Corporate and other obligations | Significant Other Observable Inputs (Level 2)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 412 8,288 [2]  
Corporate and other obligations | Significant Unobservable Inputs (Level 3)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 0 650 [2]  
Common trusts and 103-12 investments
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 673,469 [4] 611,361 [4]  
Common trusts and 103-12 investments | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 0 0  
Common trusts and 103-12 investments | Significant Other Observable Inputs (Level 2)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 673,469 611,361  
Common trusts and 103-12 investments | Significant Unobservable Inputs (Level 3)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 0 0  
Private equity funds
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 27,083 [5] 17,797 [5]  
Private equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 0 0  
Private equity funds | Significant Other Observable Inputs (Level 2)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value 0 0  
Private equity funds | Significant Unobservable Inputs (Level 3)
      
Pension plans' assets by level within the fair value hierarchy      
Total assets at fair value $ 27,083 $ 17,797  
[1] This investment category includes publicly traded equity investments directly held by the plans. Investments are valued at the unadjusted quoted close prices reported on the reporting date.
[2] The insurance company nonpooled separate account is focused on capital preservation and invests in fixed-income securities and money market instruments. The account is composed of publicly traded and privately held corporate bonds, money market and mortgage backed assets. Publicly traded bonds, money market and mortgage backed securities are valued at the closing market price on the reporting date. Privately held bonds are valued at fair value as determined by the fund directors and general partners.
[3] This investment category is composed of publicly traded bonds and asset backed securities which are valued at the quoted closing market prices on the reporting date.
[4] Common trusts and 103-12 investments are comprised of a number of investment funds that invest in a diverse portfolio of assets including equity securities, corporate and governmental bonds, equity and credit indexes, and money markets. Trusts are valued at the net asset value ("NAV") as determined by their custodian. NAV represent the accumulation of the unadjusted quoted close prices on the reporting date for the underlying investments divided by the total shares outstanding at the reporting dates.
[5] Private equity funds consist of four funds seeking capital appreciation by investing in private equity investment partnerships and venture capital companies. Funds are comprised of unrestricted and restricted publicly traded securities and privately held securities. Unrestricted securities are valued at the closing market price on the reporting date. Restricted securities may be valued at a discount from such closing public market price, depending on facts and circumstances. Privately held securities are valued at fair value as determined by the fund directors and general partners.