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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2013
Fair Value Disclosures [Abstract] |
Categorization of Investments and Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table presents the categorization of investments and certain other financial assets measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012:
| September 30, 2013
| Level I |  | Level II |  | Level III |  | Total
Corporate Bonds, Municipal Bonds and Other Debt Securities (1) | $ | — |  |  | $ | 31,150 |  |  | $ | — |  |  | $ | 31,150 |
Securities Investments (1) | 11,398 |  |  | 3,363 |  |  | — |  |  | 14,761 |
Mutual Funds | 8,888 |  |  | — |  |  | — |  |  | 8,888 |
Financial Instruments Owned and Pledged as Collateral at Fair Value | 84,866 |  |  | — |  |  | — |  |  | 84,866 |
Total Assets Measured At Fair Value | $ | 105,152 |  |  | $ | 34,513 |  |  | $ | — |  |  | $ | 139,665 |
| December 31, 2012
| Level I |  | Level II |  | Level III |  | Total
Corporate Bonds, Municipal Bonds and Other Debt Securities (1) | $ | — |  |  | $ | 38,482 |  |  | $ | — |  |  | $ | 38,482 |
Securities Investments | 9,138 |  |  | 2,442 |  |  | — |  |  | 11,580 |
Mutual Funds | 11,346 |  |  | — |  |  | — |  |  | 11,346 |
Financial Instruments Owned and Pledged as Collateral at Fair Value | 120,594 |  |  | — |  |  | — |  |  | 120,594 |
Total Assets Measured At Fair Value | $ | 141,078 |  |  | $ | 40,924 |  |  | $ | — |  |  | $ | 182,002 |
(1) | Includes $13,756 and $24,863 of treasury bills, municipal bonds and commercial paper classified within Cash and Cash Equivalents on the Unaudited Condensed Consolidated Statements of Financial Condition as of September 30, 2013 and December 31, 2012, respectively.
Carrying Amount and Estimated Fair Value of Financial Instrument Assets and Liabilities which are Not Measured at Fair Value | The carrying amount and estimated fair value of the Company’s financial instrument assets and liabilities which are not measured at fair value on the Unaudited Condensed Consolidated Statements of Financial Condition are listed in the tables below.
|  |  | September 30, 2013
| Carrying |  | Estimated Fair Value
| Amount |  | Level I |  | Level II |  | Level III |  | Total
Financial Assets: |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents | $ | 230,042 |  |  | $ | 230,042 |  |  | $ | — |  |  | $ | — |  |  | $ | 230,042 |
Securities Purchased Under Agreements to Resell | 7,075 |  |  | — |  |  | 7,075 |  |  | — |  |  | 7,075 |
Accounts Receivable | 57,769 |  |  | — |  |  | 57,769 |  |  | — |  |  | 57,769 |
Receivable from Employees and Related Parties | 9,210 |  |  | — |  |  | 9,210 |  |  | — |  |  | 9,210 |
Assets Segregated for Bank Regulatory Requirements | 10,200 |  |  | 10,200 |  |  | — |  |  | — |  |  | 10,200 |
Financial Liabilities: |  |  |  |  |  |  |  |  |
Accounts Payable and Accrued Expenses | $ | 18,648 |  |  | $ | — |  |  | $ | 18,648 |  |  | $ | — |  |  | $ | 18,648 |
Securities Sold Under Agreements to Repurchase | 92,110 |  |  | — |  |  | 92,110 |  |  | — |  |  | 92,110 |
Payable to Employees and Related Parties | 14,977 |  |  | — |  |  | 14,977 |  |  | — |  |  | 14,977 |
Notes Payable | 102,748 |  |  | — |  |  | 127,682 |  |  | — |  |  | 127,682 |
|  |  | December 31, 2012
| Carrying |  | Estimated Fair Value
| Amount |  | Level I |  | Level II |  | Level III |  | Total
Financial Assets: |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents | $ | 234,568 |  |  | $ | 234,568 |  |  | $ | — |  |  | $ | — |  |  | $ | 234,568 |
Accounts Receivable | 89,098 |  |  | — |  |  | 89,098 |  |  | — |  |  | 89,098 |
Receivable from Employees and Related Parties | 5,166 |  |  | — |  |  | 5,166 |  |  | — |  |  | 5,166 |
Assets Segregated for Bank Regulatory Requirements | 10,200 |  |  | 10,200 |  |  | — |  |  | — |  |  | 10,200 |
Financial Liabilities: |  |  |  |  |  |  |  |  |
Accounts Payable and Accrued Expenses | $ | 17,909 |  |  | $ | — |  |  | $ | 17,909 |  |  | $ | — |  |  | $ | 17,909 |
Securities Sold Under Agreements to Repurchase | 120,787 |  |  | — |  |  | 120,787 |  |  | — |  |  | 120,787 |
Payable to Employees and Related Parties | 12,964 |  |  | — |  |  | 12,964 |  |  | — |  |  | 12,964 |
Notes Payable | 101,375 |  |  | — |  |  | 136,860 |  |  | — |  |  | 136,860 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + 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=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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