FINANCIAL INSTRUMENTS, Available-For-Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012
FINANCIAL INSTRUMENTS [Abstract]
Available-for-sale securities, gross realized gains (losses), sale proceeds	$ 9,395
Maximum realized gains on available for sale securities	99
Summary of available-for-sale securities [Abstract]
Amortized Cost		9,263
Gross Unrealized Gains		103
Gross Unrealized Losses		0
Fair Value		9,366
U.S. government obligations and agency securities [Member]
Summary of available-for-sale securities [Abstract]
Amortized Cost		6,775
Gross Unrealized Gains		54
Gross Unrealized Losses		0
Fair Value		6,829
U.S. corporate debt [Member]
Summary of available-for-sale securities [Abstract]
Amortized Cost		651
Gross Unrealized Gains		13
Gross Unrealized Losses		0
Fair Value		664
Foreign corporate debt and equity securities [Member]
Summary of available-for-sale securities [Abstract]
Amortized Cost		1,837
Gross Unrealized Gains		36
Gross Unrealized Losses		0
Fair Value		$ 1,873

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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- 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.

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