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Summary of Offsetting Assets and Liabilities (Tables)
 9 Months Ended
Sep. 30, 2015
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: 
 

September 30, 2015
 

 
 
Gross fair value not offset
 
 
 

 
 
in balance sheets
 
 
 

Gross fair value of
 
Financial
 
Cash collateral
 
Net
Financial instruments (assets):

recognized assets (1)
 
instruments
 
received
 
fair value
Derivative instruments (2)

$
67,807


$
(39,861
)

$
15,168


$
12,778

Short-term reverse repurchase agreements (3)

75,000


(75,000
)

—


—

Total financial instruments (assets)

$
142,807


$
(114,861
)

$
15,168


$
12,778


 

September 30, 2015
 

 
 
Gross fair value not offset
 
 
 

 
 
in balance sheets
 
 
 

Gross fair value of
 
Financial
 
Cash collateral
 
Net
Financial instruments (liabilities):

recognized liabilities (1)
 
instruments
 
pledged
 
fair value
Derivative instruments (4)

$
101,261


$
(39,861
)

$
(61,400
)

$
—

(1) The gross fair value of derivative instrument and short-term reverse repurchase agreement assets are not netted against offsetting liabilities for presentation on the condensed consolidated balance sheets.
(2) The estimated fair value of derivative instrument assets is reported in other assets in the condensed consolidated balance sheets. The estimated fair value of derivative transactions entered into under ISDA master agreements include income and expense accruals.
(3) The estimated fair value of short-term reverse repurchase agreement assets is reported in short-term investments in the condensed consolidated balance sheets.  The collateral is held by an independent third-party custodian under a tri-party agreement.
(4) The estimated fair value of derivative instrument liabilities is reported in other liabilities in the condensed consolidated balance sheets. Derivative transactions entered into under ISDA master agreements include income and expense accruals.
 
 

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

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