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Derivative Instruments and Hedging Activities (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative Assets    
Gross amounts of recognized assets $ 4,041 $ 13,792
Gross amounts offset in the statement of financial position (4,041) (10,773)
Net amounts of assets presented in the statement of financial position   3,019
Gross amounts financial instrument not offset in the statement of financial position   373
Net amount   3,392
Derivative Liabilities    
Gross amounts of recognized liabilities 77,469 24,685
Gross amounts offset in the statement of financial position (4,041) (10,773)
Net amounts of liabilities presented in the statement of financial position 73,428 13,912
Gross amounts of financial instruments not offset in the statement of financial position 218  
Net amount $ 73,646 $ 13,912