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Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Assets
Deposits with clearing organization	$ 64,806	$ 35,816
Securities owned:
Investments	11,675
Level 1 [Member] | U.S. Agency Securities [Member]
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	10,197
Level 1 [Member] | Mortgage and other asset-backed securities [Member]
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Level 1 [Member] | Municipal obligations [Member]
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Level 1 [Member] | Convertible bonds [Member]
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Level 2 [Member]
Securities owned:
To-be-announced securities	168	2,254
Securities sold, but not yet purchased
TBAs	5,846	5,791
Level 2 [Member] | Other [Member]
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Level 3 [Member] | Other [Member]
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member]
Assets
Cash equivalents	44,035	30,924
Cash and Securities segregated for regulatory and other purposes	11,498	11,500
Deposits with clearing organization	9,094	9,095
Securities owned:
Securities owned, at fair value	1,100,644	924,542
Investments	48,747	46,958
Derivative contracts		20
To-be-announced securities	5,846	5,791
Securities purchased under agreement to resell	5,225	847,610
Total	1,255,089	1,876,439
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	94,153	69,415
Investments	67	26
Derivative contracts	2,549	2,421
TBAs	168	2,254
Securities sold under agreements to repurchase	52,584
Total	149,521	74,116
Fair value on a recurring basis [Member] | Other [Member]
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	15	122
Fair value on a recurring basis [Member] | US Treasury Securities [Member]
Securities owned:
Securities owned, at fair value	708,063	627,870
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	35,563	27,462
Fair value on a recurring basis [Member] | U.S. Agency Securities [Member]
Securities owned:
Securities owned, at fair value	88,563	54,358
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	10,234	47
Fair value on a recurring basis [Member] | Sovereign obligations [Member]
Securities owned:
Securities owned, at fair value	29	577
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member] | Corporate debt and other obligations [Member]
Securities owned:
Securities owned, at fair value	26,233	27,188
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	4,636	3,696
Fair value on a recurring basis [Member] | Mortgage and other asset-backed securities [Member]
Securities owned:
Securities owned, at fair value	3,416	4,609
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	7	14
Fair value on a recurring basis [Member] | Municipal obligations [Member]
Securities owned:
Securities owned, at fair value	111,104	54,963
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	461	485
Fair value on a recurring basis [Member] | Convertible bonds [Member]
Securities owned:
Securities owned, at fair value	50,923	50,157
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	10,953	8,533
Fair value on a recurring basis [Member] | Corporate equities [Member]
Securities owned:
Securities owned, at fair value	44,630	38,634
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	32,284	29,056
Fair value on a recurring basis [Member] | Other [Member]
Securities owned:
Securities owned, at fair value	67,683	66,185
Fair value on a recurring basis [Member] | Level 1 [Member]
Assets
Cash equivalents	44,035	30,924
Cash and Securities segregated for regulatory and other purposes	11,498	11,500
Deposits with clearing organization	9,094	9,095
Securities owned:
Securities owned, at fair value	802,547	703,405
Investments	368	1,512
Derivative contracts
To-be-announced securities
Securities purchased under agreement to resell
Total	867,542	756,436
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	64,862	44,001
Investments	67	26
Derivative contracts	69	66
TBAs
Securities sold under agreements to repurchase
Total	64,998	44,093
Fair value on a recurring basis [Member] | Level 1 [Member] | Other [Member]
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	15	72
Fair value on a recurring basis [Member] | Level 1 [Member] | US Treasury Securities [Member]
Securities owned:
Securities owned, at fair value	708,063	627,870
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	35,563	27,462
Fair value on a recurring basis [Member] | Level 1 [Member] | U.S. Agency Securities [Member]
Securities owned:
Securities owned, at fair value	44,923	32,663
Fair value on a recurring basis [Member] | Level 1 [Member] | Sovereign obligations [Member]
Securities owned:
Securities owned, at fair value
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member] | Level 1 [Member] | Corporate debt and other obligations [Member]
Securities owned:
Securities owned, at fair value	13,369	12,538
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member] | Level 1 [Member] | Mortgage and other asset-backed securities [Member]
Securities owned:
Securities owned, at fair value
Fair value on a recurring basis [Member] | Level 1 [Member] | Municipal obligations [Member]
Securities owned:
Securities owned, at fair value
Fair value on a recurring basis [Member] | Level 1 [Member] | Convertible bonds [Member]
Securities owned:
Securities owned, at fair value
Fair value on a recurring basis [Member] | Level 1 [Member] | Corporate equities [Member]
Securities owned:
Securities owned, at fair value	33,153	29,150
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	19,087	16,467
Fair value on a recurring basis [Member] | Level 1 [Member] | Other [Member]
Securities owned:
Securities owned, at fair value	3,039	1,184
Fair value on a recurring basis [Member] | Level 2 [Member]
Assets
Cash equivalents
Cash and Securities segregated for regulatory and other purposes
Deposits with clearing organization
Securities owned:
Securities owned, at fair value	223,321	152,557
Investments	35,619	32,964
Derivative contracts		20
To-be-announced securities	5,846	5,791
Securities purchased under agreement to resell	5,225	847,610
Total	270,011	1,038,942
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	29,291	25,364
Investments
Derivative contracts	146	8
TBAs	168	2,254
Securities sold under agreements to repurchase	52,584
Total	82,189	27,626
Fair value on a recurring basis [Member] | Level 2 [Member] | US Treasury Securities [Member]
Securities owned:
Securities owned, at fair value
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member] | Level 2 [Member] | U.S. Agency Securities [Member]
Securities owned:
Securities owned, at fair value	43,640	21,695
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	37	47
Fair value on a recurring basis [Member] | Level 2 [Member] | Sovereign obligations [Member]
Securities owned:
Securities owned, at fair value	29	577
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member] | Level 2 [Member] | Corporate debt and other obligations [Member]
Securities owned:
Securities owned, at fair value	12,864	14,650
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	4,636	3,696
Fair value on a recurring basis [Member] | Level 2 [Member] | Mortgage and other asset-backed securities [Member]
Securities owned:
Securities owned, at fair value	3,404	4,593
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	7	14
Fair value on a recurring basis [Member] | Level 2 [Member] | Municipal obligations [Member]
Securities owned:
Securities owned, at fair value	100,984	51,401
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	461	485
Fair value on a recurring basis [Member] | Level 2 [Member] | Convertible bonds [Member]
Securities owned:
Securities owned, at fair value	50,923	50,157
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	10,953	8,533
Fair value on a recurring basis [Member] | Level 2 [Member] | Corporate equities [Member]
Securities owned:
Securities owned, at fair value	11,477	9,484
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value	13,197	12,589
Fair value on a recurring basis [Member] | Level 2 [Member] | Other [Member]
Securities owned:
Securities owned, at fair value
Fair value on a recurring basis [Member] | Level 3 [Member]
Assets
Cash equivalents
Cash and Securities segregated for regulatory and other purposes
Deposits with clearing organization
Securities owned:
Securities owned, at fair value	74,776	68,579
Investments	12,760	12,482
Derivative contracts		2,347
To-be-announced securities
Securities purchased under agreement to resell
Total	87,536	81,061
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value		50
Investments
Derivative contracts	2,334
TBAs
Securities sold under agreements to repurchase
Total	2,334	2,397
Fair value on a recurring basis [Member] | Level 3 [Member] | US Treasury Securities [Member]
Securities owned:
Securities owned, at fair value
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member] | Level 3 [Member] | U.S. Agency Securities [Member]
Securities owned:
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Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
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Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member] | Level 3 [Member] | Mortgage and other asset-backed securities [Member]
Securities owned:
Securities owned, at fair value	12	16
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member] | Level 3 [Member] | Municipal obligations [Member]
Securities owned:
Securities owned, at fair value	10,120	3,562
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member] | Level 3 [Member] | Convertible bonds [Member]
Securities owned:
Securities owned, at fair value
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member] | Level 3 [Member] | Corporate equities [Member]
Securities owned:
Securities owned, at fair value
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value
Fair value on a recurring basis [Member] | Level 3 [Member] | Other [Member]
Securities owned:
Securities owned, at fair value	64,644	65,001
Securities sold, but not yet purchased
Securities sold, but not yet purchased, at fair value		$ 50

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The amount shown on an entity's books for liabilities related to investment contracts (guaranteed investment contract, annuities), net of any reductions or offsets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 825

-Section 25

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6487514&loc=d3e32427-158581



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 14

-Article 7



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 97

-Paragraph 15

-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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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

-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 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The amount of securities that an institution sells and agrees to repurchase (seller-borrower) at a specified date for a specified price, net of any reductions or offsets. Most repurchase agreements involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit (CDs), are sometimes used in repurchase agreements. A repurchase agreement is similar to the seller-borrower's borrowing funds equal to the sales price of the related securities with the securities as collateral. Maturities of such agreements are flexible and generally vary from one day to 270 days.

+ References

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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 4

-IssueDate 2006-05-01

-Chapter 14

-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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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents securities sold but not yet purchased, that is, sold short, which leads to a liability for the obligation to purchase said securities at a future date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6957929&loc=d3e63862-112815



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-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Paragraph 38, 39

-IssueDate 2006-05-01

-Chapter 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.

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