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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: |  |
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] | 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 3 [Member] | Corporate debt and other 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 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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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References 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 + Details
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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. + Details
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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 + Details
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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. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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. + Details
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