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Financial Instruments (Details 6) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Assets: |  |
Derivatives asset, Notional | $ 100,000 | $ 100,000
Derivatives asset, Fair Value | 0 | 20
Liabilities: |  |
Derivative liability, notional | 7,677,389 | 6,062,292
Derivative liability, Fair Value | 2,549 | 2,421
Derivatives designated as hedging instruments [Member] | Interest rate contract [Member] | Cap [Member] |  |
Assets: |  |
Derivatives asset, Notional | 100,000 | 100,000
Derivatives asset, Fair Value | 0 | 20
Derivatives not designated as hedging instruments [Member] | Commodity contracts [Member] | Federal Funds Futures [Member] |  |
Liabilities: |  |
Derivative liability, notional | 7,580,000 | 5,985,000
Derivative liability, Fair Value | 145 | 8
Derivatives not designated as hedging instruments [Member] | Commodity contracts [Member] | U.S. Treasury Futures [Member] |  |
Liabilities: |  |
Derivative liability, notional | 20,000 | 20,000
Derivative liability, Fair Value | 69 | 66
Derivatives not designated as hedging instruments [Member] | Commodity contracts [Member] | Euro Dollars Futures [Member] |  |
Liabilities: |  |
Derivative liability, notional | 37,000 |
Derivative liability, Fair Value | 1 |
Derivatives not designated as hedging instruments [Member] | Other contracts [Member] | Auction rate securities purchase commitment [Member] |  |
Liabilities: |  |
Derivative liability, notional | 40,389 | 57,292
Derivative liability, Fair Value | $ 2,334 | $ 2,347

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