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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Amounts reclassified out of each component of accumulated other comprehensive income    
Interest income $ 37,393 $ 32,595
Net actuarial losses (305) (616)
Net transition obligation (4) (4)
Prior service cost (5) (5)
Tax (expense) benefit (5,518) 119,802
Net income (loss) 9,808 137,309
Amount Reclassified from AOCI
    
Amounts reclassified out of each component of accumulated other comprehensive income    
Net income (loss) (187) (11,618)
Unrealized loss on derivatives | Amount Reclassified from AOCI
    
Amounts reclassified out of each component of accumulated other comprehensive income    
Interest income   (394)
Tax (expense) 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 (305) [1] (616) [1]
Net transition obligation (4) [1] (4) [1]
Prior service cost (5) [1] (5) [1]
Total before tax (314) (625)
Tax (expense) benefit 127  
Net of tax $ (187) $ (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).