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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Amounts reclassified out of each component of accumulated other comprehensive income    
Interest income $ 32,595 $ 32,903
Total before income tax (17,507) (13,478)
Income tax benefit 119,802  
Net of tax 137,309 13,478
Amount Reclassified from AOCI
    
Amounts reclassified out of each component of accumulated other comprehensive income    
Net of tax 11,618  
Unrealized loss on derivatives | Amount Reclassified from AOCI
    
Amounts reclassified out of each component of accumulated other comprehensive income    
Interest income 394  
Income tax benefit 10,599  
Net of tax 10,993  
Amortization of defined benefit plan items | Amount Reclassified from AOCI
    
Amounts reclassified out of each component of accumulated other comprehensive income    
Net actuarial losses 616 [1]  
Transition obligations 4 [1]  
Prior service cost 5 [1]  
Total before income tax 625  
Net of tax $ 625  
[1] (1) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 14 for additional details).