This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References+ Details

Investments in debt and equity securities which are categorized neither as trading securities nor held-to-maturity securities and which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

+ References

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-Publisher FASB

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-Name Accounting Research Bulletin (ARB)

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+ Details

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details

- Definition

The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

Financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time, usually less than one year or the normal operating cycle, whichever is longer) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

+ References

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-Publisher FASB

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-Glossary Trading Securities

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+ Details

- Definition

Debt securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time, usually less than one year or the normal operating cycle, whichever is longer) or for debt securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

+ References

+ Details

Investments Narrative (Details) (USD $)	12 Months Ended
Investments Narrative (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Investments [Line Items]
Available-for-sale Securities, Current	$ 159,539,000	$ 105,724,000
Trading Securities, Current	113,505,000	29,161,000
Payments to Acquire Available-for-sale Securities	73,192,000	99,284,000	1,388,000
Available For Sale Securities Unrealized Gain Position Fair Value	48,400,000
Available-for-sale Securities, Fair Value Disclosure	111,100,000
Fixed-Income Mutual Funds [Member]
Schedule of Investments [Line Items]
Payments to Acquire Available-for-sale Securities	60,000,000
Available-for-sale Securities, Gross Unrealized Gains	461,000	662,000
Available-for-sale Securities, Gross Unrealized Losses	950,000	136,000
Total Fluctuating-Value Mutual Funds [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	2,498,000	5,862,000
Available-for-sale Securities, Gross Unrealized Losses	1,875,000	160,000
Consolidated feeder fund investment in offshore master investment fund [Member]
Schedule of Investments [Line Items]
Trading Securities, Current	17,900,000
Stocks of large-cap U.S. and international companies [Member]
Schedule of Investments [Line Items]
Trading Securities, Current	10,900,000
Money Market Funds [Member]
Schedule of Investments [Line Items]
Trading Securities, Debt, Current	$ 77,100,000