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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

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