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Financial Instruments (Details 7) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Mar. 31, 2011	Jun. 30, 2012
Fair value amounts of derivative instruments and their effect on the statement of operations
Recognized in Income on Derivatives (pre-tax) Gain/(Loss)	$ 721,000		$ (405,000)
Recognized in Other Comprehensive Income on Derivatives Effective Portion (after-tax) Gain/(Loss)		69,000
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain/ (Loss)
Cap [Member] | Cash Flow Hedges [Member] | Interest Expense [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain/ (Loss)
Euro Dollars Futures [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain/ (Loss)
Commodity contracts [Member] | Derivatives used for trading and investment [Member] | U.S. Treasury Futures [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain/ (Loss)
Commodity contracts [Member] | Derivatives used for trading and investment [Member] | Federal Funds Futures [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain/ (Loss)
Commodity contracts [Member] | Principal Transaction Revenue [Member] | Derivatives used for trading and investment [Member] | U.S. Treasury Futures [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Recognized in Income on Derivatives (pre-tax) Gain/(Loss)	(894,000)		(638,000)
Recognized in Other Comprehensive Income on Derivatives Effective Portion (after-tax) Gain/(Loss)
Commodity contracts [Member] | Principal Transaction Revenue [Member] | Derivatives used for trading and investment [Member] | Federal Funds Futures [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Recognized in Income on Derivatives (pre-tax) Gain/(Loss)	71,000		260,000
Recognized in Other Comprehensive Income on Derivatives Effective Portion (after-tax) Gain/(Loss)
Commodity contracts [Member] | Principal Transaction Revenue [Member] | Derivatives used for trading and investment [Member] | Euro-dollar Futures [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Recognized in Income on Derivatives (pre-tax) Gain/(Loss)			(28,000)
Commodity contracts [Member] | Euro Dollars Futures [Member] | Principal Transaction Revenue [Member] | Derivatives used for trading and investment [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Recognized in Income on Derivatives (pre-tax) Gain/(Loss)	(28,000)
Recognized in Other Comprehensive Income on Derivatives Effective Portion (after-tax) Gain/(Loss)
Other contracts [Member] | Derivatives used for trading and investment [Member] | Auction Rate Securities Purchase Commitment [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain/ (Loss)
Other contracts [Member] | Principal Transaction Revenue [Member] | Derivatives used for trading and investment [Member] | Auction Rate Securities Purchase Commitment [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Recognized in Income on Derivatives (pre-tax) Gain/(Loss)	1,572,000		13,000
Recognized in Other Comprehensive Income on Derivatives Effective Portion (after-tax) Gain/(Loss)
Interest rate contract [Member] | Cap [Member] | Cash Flow Hedges [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Recognized in Income on Derivatives (pre-tax) Gain/(Loss)			(12,000)
Recognized in Other Comprehensive Income on Derivatives Effective Portion (after-tax) Gain/(Loss)
Interest rate contract [Member] | Cap [Member] | Cash Flow Hedges [Member] | Interest Expense [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain/ (Loss)
Interest rate contract [Member] | Swaps [Member] | Cash Flow Hedges [Member] | Interest Expense [Member]
Fair value amounts of derivative instruments and their effect on the statement of operations
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain/ (Loss)

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- Definition

Gain loss on derivatives pre tax recognized in income.

+ References

No definition available.

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-Clause 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4D

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-Clause 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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