Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities Credit Risk - Counterparty Exposure (Details)

v2.4.0.8
Derivative Instruments and Hedging Activities Credit Risk - Counterparty Exposure (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Credit Derivatives [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 549,859 $ 462,080
Derivative Liability, Fair Value, Gross Liability 22,081 129,294
Collateral Securities Repledged, Delivered, or Used (249,256)  
Collateral Already Posted, Aggregate Fair Value $ 200,420