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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2013
Fair Value Measurements [Abstract] |
The assets accounted for at fair value on a recurring basis |
|  | Fair Value Measurements As of March 31, 2013 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash and cash equivalents |  | $ | 482,876 |  |  | $ | — |  |  | $ | — |  |  | $ | 482,876 |
Restricted cash and cash equivalents |  |  | 2,653 |  |  |  | — |  |  |  | — |  |  |  | 2,653 |
Available for sale portfolio: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US government obligations and agencies |  |  | — |  |  |  | 8,013 |  |  |  | — |  |  |  | 8,013 |
Corporate bonds |  |  | — |  |  |  | 5,955 |  |  |  | — |  |  |  | 5,955 |
Total available for sale portfolio investments |  | $ | — |  |  | $ | 13,968 |  |  | $ | — |  |  | $ | 13,968 |
Total |  | $ | 485,529 |  |  | $ | 13,968 |  |  | $ | — |  |  | $ | 499,497 |
|  | Fair Value Measurements As of December 31, 2012 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash and cash equivalents |  | $ | 347,392 |  |  | $ | — |  |  | $ | — |  |  | $ | 347,392 |
Restricted cash and cash equivalents |  |  | 33,009 |  |  |  | — |  |  |  | — |  |  |  | 33,009 |
Trading portfolio: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US government obligations and agencies |  |  | — |  |  |  | 4,009 |  |  |  | — |  |  |  | 4,009 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Metals and mining |  |  | 26,130 |  |  |  | — |  |  |  | — |  |  |  | 26,130 |
Energy |  |  | 10,868 |  |  |  | — |  |  |  | — |  |  |  | 10,868 |
Other |  |  | 8,215 |  |  |  | — |  |  |  | — |  |  |  | 8,215 |
Exchange traded and mutual funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Metals and mining |  |  | 21,989 |  |  |  | — |  |  |  | — |  |  |  | 21,989 |
Agriculture |  |  | 10,265 |  |  |  | — |  |  |  | — |  |  |  | 10,265 |
Energy |  |  | 5,068 |  |  |  |  |  |  |  |  |  |  |  | 5,068 |
Indices |  |  | 2,506 |  |  |  | — |  |  |  | — |  |  |  | 2,506 |
Non-hedging derivative liability, net (2) |  |  | — |  |  |  | (21 | ) |  |  | — |  |  |  | (21 | )
Other investments |  |  | 317 |  |  |  | — |  |  |  | — |  |  |  | 317 |
Total trading portfolio investments |  | $ | 85,358 |  |  | $ | 3,988 |  |  | $ | — |  |  | $ | 89,346 |
Total investments |  | $ | 465,759 |  |  | $ | 3,988 |  |  | $ | — |  |  | $ | 469,747 |
Summarizes the carrying value and estimated fair values of the financial instruments not carried at fair value |
|  | As of March 31, 2013 |
|  | Carrying value |  |  | (Level 3) Estimated Fair Value |
Liabilities: |  |  |  |  |  |  |  |
Long-term debt |  | $ | 19,853 |  |  | $ | 17,682 |
|  | As of December 31, 2012 |
|  | Carrying value |  |  | (Level 3) Estimated Fair Value |
Liabilities: |  |  |  |  |  |  |  |
Long-term debt |  | $ | 20,221 |  |  | $ | 18,057 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 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 157 -Paragraph 32 -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 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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