FAIR VALUE MEASUREMENTS: (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011 M	Dec. 31, 2008	Dec. 31, 2010
Available for Sale:
Amortized Cost	$ 65,844		$ 35,539
Fair Value	65,288		33,953
Unrealized Gains	402		49
Unrealized Losses	(958)		(1,635)
Auction rate security
Available for Sale:
Amortized Cost	8,410		8,410
Fair Value	7,453		6,775
Unrealized Losses	(957)		(1,635)
Available for sale, non-current	7,453		6,775
Other than temporary impairment		5,140
Temporary decline in market value of auction rate securities	957
Auction rate securities, par value	13,550
Minimum period estimated by the entity for the ARS market to improve (in months)	12
Municipal bonds
Available for Sale:
Amortized Cost	57,389		27,073
Fair Value	57,791		27,122
Unrealized Gains	402		49
Mutual funds
Available for Sale:
Amortized Cost	45		56
Fair Value	44		56
Unrealized Losses	$ (1)

The aggregate par value of the auction rate securities.

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Greater than period estimated by the entity for the securities market to improve.

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Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer.

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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 item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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