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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Amounts reclassified out of each component of accumulated other comprehensive income        
Interest income $ 34,992 $ 32,479 $ 67,587 $ 65,382
Income before income taxes 16,212 10,812 33,719 24,290
Income tax benefit (1,945)   117,857  
Net of tax 14,267 10,812 151,576 24,290
Amount Reclassified from AOCI
        
Amounts reclassified out of each component of accumulated other comprehensive income        
Net of tax 375   11,993  
Unrealized gain/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 618 [1]   1,234 [1]  
Transition obligations 4 [1]   8 [1]  
Prior service cost 5 [1]   10 [1]  
Income before income taxes 627   1,252  
Income tax benefit (252)   (252)  
Net of tax $ 375   $ 1,000  
[1] (1) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 14 for additional details).