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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2012
Fair Value Disclosures [Abstract] |
Fair Value Of Certain Financial Assets And Liabilities | The fair value of certain financial assets and liabilities of the Company was determined using the following inputs:
|  |  |  | December 31, 2012
|  |  |  | Fair Value Measurements at Reporting Date Using
|  | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets |  |  |  |  |  |  |  |
Equity available-for-sale securities |  | $ | 15,926 |  |  | $ | 15,926 |  |  | $ | — |  |  | $ | — |
Fixed-income available-for-sale securities |  | 59,943 |  |  | — |  |  | 59,943 |  |  | — |
Fixed income securities owned |  | 20,088 |  |  | — |  |  | 20,088 |  |  | — |
Trading securities |  | 5,909 |  |  | 4,706 |  |  | — |  |  | 1,203 |
|  | $ | 101,866 |  |  | $ | 20,632 |  |  | $ | 80,031 |  |  | $ | 1,203 |
|  |  |  | December 31, 2011
|  |  |  | Fair Value Measurements at Reporting Date Using
|  | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets |  |  |  |  |  |  |  |
Equity available-for-sale securities |  | $ | 8,010 |  |  | $ | 8,010 |  |  | $ | — |  |  | $ | — |
Fixed-income available-for-sale securities |  | 74,998 |  |  | — |  |  | 74,998 |  |  | — |
Fixed income securities owned |  | 20,949 |  |  | — |  |  | 20,949 |  |  | — |
Trading securities |  | 56,325 |  |  | 3,702 |  |  | — |  |  | 52,623 |
|  | $ | 160,282 |  |  | $ | 11,712 |  |  | $ | 95,947 |  |  | $ | 52,623 |
Reconciliation For All Assets And Liabilities Of The Company Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3) | The table below presents a reconciliation for all assets and liabilities of the Company measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the period from January 1, 2011 to December 31, 2012:
| Trading Securities
Balance, January 1, 2011 | $ | 100,645 |
Purchases | 1,215 |
Issuances | — |
Principal prepayments and settlements | (17,921 | )
Sales | (34,706 | )
Total gains or (losses) (realized/unrealized): |
Included in earnings | 3,390 |
Included in other comprehensive income | — |
Transfers in and out of Level 3 | — |
Balance, December 31, 2011 | $ | 52,623 |
Purchases | 13 |
Issuances | — |
Principal prepayments and settlements | (10,728 | )
Sales | (53,920 | )
Total gains or (losses) (realized/unrealized): |
Included in earnings | 13,215 |
Included in other comprehensive income | — |
Transfers in and out of Level 3 | — |
Balance, December 31, 2012 | $ | 1,203 |

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- Definition Tabular disclosure of the amount of gains or losses for the period included in earnings or resulted in a change to net assets, have arisen from the use of significant unobservable inputs (level 3) to measure the fair value of assets, liabilities, and financial instruments classified in shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph d -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 157 -Paragraph 32 -Subparagraph c(1) -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 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1),(d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + 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=7578670&loc=d3e19190-110258 + Details
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