Investments - Other (Details) (Fair Value, Measurements, Recurring [Member], Significant Other Observable Inputs (Level 2) [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Sold, Not yet Purchased, Fair Value Disclosure	$ 0	$ 55,830

- 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.

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