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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS, Additional Disclosures 2 (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Target allocation percentage of plan assets by asset category [Abstract]      
Equity securities, range minimum (in hundredths) 62.50% 62.50%  
Equity securities, range maximum (in hundredths) 72.50% 72.50%  
S and P 500 Stock Index, range minimum (in hundredths) 22.50% 14.50%  
S and P 500 Stock Index, range maximum (in hundredths) 52.50% 24.50%  
Large cap growth, range minimum (in hundredths)   4.00%  
Large cap growth, range maximum (in hundredths)   14.00%  
Large cap value, range minimum (in hundredths)   4.00%  
Large cap value, range maximum (in hundredths)   14.00%  
Small cap growth, range minimum (in hundredths) 0.00% 0.00%  
Small cap growth, range maximum (in hundredths) 10.00% 10.00%  
Small cap value, range minimum (in hundredths) 0.00% 0.00%  
Small cap value, range maximum (in hundredths) 10.00% 10.00%  
International, range minimum (in hundredths) 10.00% 10.00%  
International, range maximum (in hundredths) 30.00% 30.00%  
Fixed income, range minimum (in hundredths) 22.50% 22.50%  
Fixed income, range maximum (in hundredths) 32.50% 32.50%  
Cash and equivalents, range minimum (in hundredths) 0.00% 0.00%  
Cash and equivalents, range maximum (in hundredths) 10.00% 10.00%  
Aggregate fixed income, range minimum (in hundredths) 10.00% 10.00%  
Aggregate fixed income, range maximum (in hundredths) 16.00% 16.00%  
Core plus fixed income, range minimum (in hundredths) 7.50% 7.50%  
Core plus fixed income, range maximum (in hundredths) 17.50% 17.50%  
Real estate, range minimum (in hundredths) 0.00% 0.00%  
Real estate, range maximum (in hundredths) 10.00% 10.00%  
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 448,406,000 $ 421,940,000 $ 337,282,000
Estimated future annual payments for pension and other postretirement benefits [Abstract]      
Contributions made to defined contribution plans classified as continuing operations 8,000,000 6,100,000 5,500,000
Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 273,041,000 218,525,000  
Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 175,365,000 203,415,000  
Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
S and P 500 Stock Index [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 168,910,000 83,993,000  
S and P 500 Stock Index [Member] | Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 168,910,000 83,993,000  
S and P 500 Stock Index [Member] | Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
S and P 500 Stock Index [Member] | Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Large Cap Growth [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   39,039,000  
Large Cap Growth [Member] | Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Large Cap Growth [Member] | Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   39,039,000  
Large Cap Growth [Member] | Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Large Cap Value [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   38,565,000  
Large Cap Value [Member] | Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   38,565,000  
Large Cap Value [Member] | Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Large Cap Value [Member] | Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Small Cap Growth [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 22,462,000 23,158,000  
Small Cap Growth [Member] | Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 22,462,000 23,158,000  
Small Cap Growth [Member] | Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Small Cap Growth [Member] | Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Small Cap Value [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20,425,000 21,340,000  
Small Cap Value [Member] | Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20,425,000 21,340,000  
Small Cap Value [Member] | Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Small Cap Value [Member] | Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International Equity Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 77,270,000 80,151,000  
International Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 77,270,000 80,151,000  
International Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash and Cash Equivalents [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11,442,000 9,627,000  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,000 1,000  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11,441,000 9,626,000  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Aggregate Fixed Income [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 64,703,000 54,393,000  
Aggregate Fixed Income [Member] | Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Aggregate Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 64,703,000 54,393,000  
Aggregate Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Core Plus Fixed Income [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 61,243,000 51,468,000  
Core Plus Fixed Income [Member] | Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 61,243,000 51,468,000  
Core Plus Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Core Plus Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Real Estate [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21,951,000 20,206,000  
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21,951,000 20,206,000  
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Plans, Defined Benefit [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 448,406,000 421,940,000 337,282,000
Estimated future employer contributions in next fiscal year 50,600,000    
Estimated future annual payments for pension and other postretirement benefits [Abstract]      
2012 50,820,000    
2013 39,650,000    
2014 32,950,000    
2015 35,270,000    
2016 36,480,000    
2017 though 2021 203,190,000    
Other Postretirement Benefit Plans, Defined Benefit [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0 0
Estimated future employer contributions in next fiscal year 5,000,000    
Estimated future annual payments for pension and other postretirement benefits [Abstract]      
2012 4,990,000    
2013 5,300,000    
2014 5,610,000    
2015 6,080,000    
2016 6,570,000    
2017 though 2021 $ 32,330,000