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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Derivative Assets    
Gross amounts of recognized assets $ 18,353 $ 54,454
Gross amounts offset in the statement of financial position (14,138) (3,630)
Net amounts of assets presented in the statement of financial position 4,215 50,824
Gross amounts financial instrument not offset in the statement of financial position 832 1,892
Net amount 5,047 52,716
Derivative Liabilities    
Gross amounts of recognized liabilities 44,037 3,822
Gross amounts offset in the statement of financial position (14,138) (3,630)
Net amounts of liabilities presented in the statement of financial position 29,899 192
Net amount $ 29,899 $ 192