Summary of Offsetting Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2013

Summary of Offsetting Assets and Liabilities

Summary of the Company's financial instruments that are subject to master netting arrangements

	September 30, 2013
			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)	$	26,852	$	(26,650	)	$	—	$	202
Short-term reverse repurchase agreements (3)	600,000		(600,000		)	—		—
Total financial instruments (assets)	$	626,852	$	(626,650	)	$	—	$	202

	September 30, 2013
			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)	$	159,717	$	(26,650	)	$	(131,503	)	$	1,564

(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 and includes income and expense accruals.

(3) The estimated fair value of short-term reverse repurchase agreement assets is reported in short-term investments, available-for sale 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 and includes income and expense accruals.

	December 31, 2012
				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)	$	26,647		$	(26,647	)	$	—	$	—
Short-term reverse repurchase agreements (3)	4,138			(4,138		)	—		—
Total financial instruments (assets)	$		30,785	$	(30,785	)	$	—	$	—

	December 31, 2012
			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)	$	87,093	$	(26,647	)	$	(54,400	)	$	6,046

(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 and includes income and expense accruals.

(3) The estimated fair value of short-term reverse repurchase agreement assets is reported in short-term investments, available-for sale 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 and includes income and expense accruals.