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Gross Amounts Associated With Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Interest Rate Swap
Derivative [Line Items]
Assets/(Liabilities)	$ 15,841
Net Asset/(Liability)	15,841	37,076
Assets/(Liabilities)		(243,945)
Cash Collateral Posted		281,021
Net Asset/(Liability)	15,841	37,076
Futures Contracts
Derivative [Line Items]
Assets/(Liabilities)	11,148
Net Asset/(Liability)	11,148
Net Asset/(Liability)	11,148
Second Interest Rate Swap
Derivative [Line Items]
Net Asset/(Liability)	8,528
Assets/(Liabilities)	(125,133)
Cash Collateral Posted	133,661
Net Asset/(Liability)	8,528
Second Futures Contracts
Derivative [Line Items]
Net Asset/(Liability)	40,980
Assets/(Liabilities)	(36,733)
Cash Collateral Posted	77,713
Net Asset/(Liability)	40,980
Forward Purchase Commitments
Derivative [Line Items]
Assets/(Liabilities)		5,452
Net Asset/(Liability)	8,264	5,452
Assets/(Liabilities)	(5,741)
Cash Collateral Posted	14,005
Net Asset/(Liability)	$ 8,264	$ 5,452

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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