Schedule of Location of Derivatives on Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivatives Fair Value [Line Items]
Derivative assets	$ 31,002	$ 26,989
Derivative liabilities	175,322	167,607
Derivative Assets
Derivatives Fair Value [Line Items]
Interest rate swaps and swaptions	27,815	15,841
Futures contracts	1,299	11,148
Forward purchase commitments	1,888
Derivative assets	31,002	26,989
Derivative Liabilities
Derivatives Fair Value [Line Items]
Interest rate swap liability	58,484	125,133
Futures contracts	96,867	36,733
Forward purchase commitments	19,971	5,741
Derivative liabilities	$ 175,322	$ 167,607

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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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Fair value as of the balance sheet date of all derivative assets designated as foreign currency fair value hedging instruments.

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