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SHORT-TERM INVESTMENTS: (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Investments
Trading securities	$ 528,300,000		$ 528,300,000		$ 66,900,000
Weighted average interest rate (as a percent)			1.71%		1.14%
Available for sale	7,500,000		7,500,000		9,300,000
Weighted average interest rate (as a percent)			0.32%		1.01%
Total short-term investments	535,753,000		535,753,000		76,209,000
Trading securities:
Interest earned	1,200,000	100,000	2,900,000	200,000
Available for sale:
Interest earned		100,000		100,000
Investment redeemed	900,000	3,000,000	1,700,000	14,200,000
Maximum interest earned	$ 100,000	$ 100,000	$ 100,000

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Represents the weighted average interest rate on debt and equity securities which are categorized neither as trading securities nor as held-to-maturity securities and that are intended be sold or will mature within one year from the balance sheet date or the normal operating cycle, whichever is longer.

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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.

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Interest income on securities classified neither as held-to-maturity nor trading ("available-for-sale securities") includes: (a) interest and dividends earned on all securities and (b) amortization and accretion (as applicable) of discounts and premiums, if any.

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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