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Derivative Instruments and Hedging Activities (Details 3) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Derivative Assets |  |
Gross amounts of recognized assets | $ 13,312 | $ 13,792
Gross amounts offset in the statement of financial position | (12,358) | (10,773)
Net amounts of assets presented in the statement of financial position | 954 | 3,019
Gross amounts financial instrument not offset in the statement of financial position |  | 373
Net amount | 954 | 3,392
Derivative Liabilities |  |
Gross amounts of recognized liabilities | 50,851 | 24,685
Gross amounts offset in the statement of financial position | (12,358) | (10,773)
Net amounts of liabilities presented in the statement of financial position | 38,493 | 13,912
Gross amounts of financial instruments not offset in the statement of financial position | 490 |
Net amount | $ 38,983 | $ 13,912

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