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Derivative Financial Instruments Schedule of financial assets and liabilities for non-customer derivative positions (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Offsetting Assets and Liabilities [Line Items]    
Total Notional Amount $ 10,405,957 $ 13,138,667
Total MTM(Loss) Gain (11,357) (66)
Cash Collateral Posted 23,505 8,115
Dealer A [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Total Notional Amount 452,476 387,258
Total MTM(Loss) Gain (4,147) (4,274)
Cash Collateral Posted 4,200 4,300
Net Exposure 53 [1] 26 [1]
Dealer B [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Total Notional Amount 327,019 322,888
Total MTM(Loss) Gain (2,889) (5,010)
Cash Collateral Posted 3,160 4,940
Net Exposure 271 [1] 0 [1]
Dealer C [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Total Notional Amount 11,714 14,477
Total MTM(Loss) Gain (908) (1,348)
Cash Collateral Posted 0 0
Net Exposure 0 [1] 0 [1]
Dealer D [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Total Notional Amount 318,886 291,627
Total MTM(Loss) Gain 2,128 5,250
Cash Collateral (Received) (2,200) (5,300)
Net Exposure 0 [1] 0 [1]
Dealer E [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Total Notional Amount 386,920 372,771
Total MTM(Loss) Gain 3,329 3,549
Cash Collateral (Received) (3,250) (3,310)
Net Exposure 0 [1] 0 [1]
Dealer F [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Total Notional Amount 8,908,942 [2] 11,749,646 [2]
Total MTM(Loss) Gain (8,870) [2] 1,767 [2]
Cash Collateral Posted 21,595 [2] 7,485 [2]
Net Exposure 12,725 [1],[2] 9,252 [1],[2]
Designated as Hedging Instrument [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 6,357 6,581
MTM Loss (2,812) (622)
Designated as Hedging Instrument [Member] | Dealer A [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 263 730
MTM Loss 0 0
Designated as Hedging Instrument [Member] | Dealer B [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 2,031 615
MTM Loss 0 0
Designated as Hedging Instrument [Member] | Dealer C [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 0 0
MTM Loss 0 0
Designated as Hedging Instrument [Member] | Dealer D [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 1,016 1,734
MTM Loss 0 0
Designated as Hedging Instrument [Member] | Dealer E [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 3,047 2,290
MTM Loss 0 (15)
Designated as Hedging Instrument [Member] | Dealer F [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 0 [2] 1,212 [2]
MTM Loss (2,812) [2] (607) [2]
Non-Hedge Accounting [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 9,855 17,062
MTM Loss (24,757) (23,087)
Non-Hedge Accounting [Member] | Dealer A [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 3,045 4,643
MTM Loss (7,455) (9,647)
Non-Hedge Accounting [Member] | Dealer B [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 1,933 3,475
MTM Loss (6,853) (9,100)
Non-Hedge Accounting [Member] | Dealer C [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 0 0
MTM Loss (908) (1,348)
Non-Hedge Accounting [Member] | Dealer D [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 2,219 4,108
MTM Loss (1,107) (592)
Non-Hedge Accounting [Member] | Dealer E [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 1,800 3,017
MTM Loss (1,518) (1,743)
Non-Hedge Accounting [Member] | Dealer F [Member]
   
Offsetting Assets and Liabilities [Line Items]    
MTM Gain 858 [2] 1,819 [2]
MTM Loss $ (6,916) [2] $ (657) [2]
[1] Net positive exposure represents over-collateralized loss positions which can be the result of DCO initial margin requirements posted in compliance with the Dodd-Frank Wall Street Reform and Consumer Protection Act.
[2] Dealer F represents Chicago Mercantile Exchange, our designated DCO.