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SHORT TERM INVESTMENTS: (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Investments
Trading securities	$ 216,400,000		$ 216,400,000		$ 66,900,000
Weighted average interest rate (as a percent)			2.02%		1.14%
Available for sale	9,000,000		9,000,000		9,300,000
Weighted average interest rate (as a percent)			0.37%		1.01%
Total short-term investments	225,396,000		225,396,000		76,209,000
Trading securities:
Interest earned	1,000,000	100,000	1,400,000	100,000
Available for sale:
Investment redeemed	400,000	7,700,000	800,000	11,200,000
Interest earned				100,000
Maximum interest earned	$ 100,000	$ 100,000	$ 100,000

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- Definition

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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Interest and dividend income on securities that are bought and held principally for the purpose of selling them in the near term ("trading securities") and on securities measured at fair value through earnings.

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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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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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