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Summary of Offsetting Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2014
Offsetting [Abstract]  
Summary of the Company's financial instruments that are subject to master netting arrangements
The following tables summarize the effect of master netting arrangements on the Company’s financial position in the normal course of business and in the event of default or bankruptcy of the Company’s counterparties: 
 
 
December 31, 2014
 
 
 
 
Gross fair value not offset
 
 
 
 
 
 
in balance sheets
 
 
 
 
Gross fair value of
 
Financial
 
Cash collateral
 
Net
Financial instruments:
 
recognized assets/liabilities (1)
 
instruments
 
received/(pledged)
 
fair value
Derivative instruments (assets) (2)
 
$
32,895

 
$
(32,595
)
 
$
279

 
$
21

Derivative instruments (liabilities) (3)
 
140,655

 
(32,595
)
 
(105,929
)
 
2,131

 
 
 
December 31, 2013
 
 
 
 
Gross fair value not offset
 
 
 
 
 
 
in balance sheets
 
 
 
 
Gross fair value of
 
Financial
 
Cash collateral
 
Net
Financial instruments:
 
recognized assets/liabilities (1)
 
instruments
 
received/(pledged)
 
fair value
Derivative instruments (assets) (2)
 
$
25,250

 
$
(25,023
)
 
$
—

 
$
227

Derivative instruments (liabilities) (3)
 
171,387

 
(25,023
)
 
(143,540
)
 
2,824

 

(1) The gross fair value of derivative instruments are not netted against offsetting liabilities for presentation on the consolidated balance sheets.
(2) The estimated fair value of derivative instrument assets is reported in other assets in the consolidated balance sheets. Derivative transactions entered into under ISDA master agreements include income and expense accruals.
(3) The estimated fair value of derivative instrument liabilities is reported in other liabilities in the consolidated balance sheets. Derivative transactions entered into under ISDA master agreements include income and expense accruals.