FINANCIAL INSTRUMENTS, Available-For-Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
FINANCIAL INSTRUMENTS [Abstract]
Available-For-Sale Securities, Gross Realized Gains (Losses), Sale Proceeds	$ 51,968
Maximum Realized Gains on Available-For-Sale Securities	489	0
Summary of Available-For-Sale Securities [Abstract]
Amortized Cost	10,038		62,325
Gross Unrealized Gains	113		483
Gross Unrealized Losses	0		(370)
Fair Value	10,151		62,438
U.S. Government Obligations and Agency Securities [Member]
Summary of Available-For-Sale Securities [Abstract]
Amortized Cost	7,286		19,421
Gross Unrealized Gains	66		177
Gross Unrealized Losses	0		0
Fair Value	7,352		19,598
U.S. Corporate Debt [Member]
Summary of Available-For-Sale Securities [Abstract]
Amortized Cost	653		24,942
Gross Unrealized Gains	14		259
Gross Unrealized Losses	0		(101)
Fair Value	667		25,100
Foreign Government Obligations and Agency Securities [Member]
Summary of Available-For-Sale Securities [Abstract]
Amortized Cost			2,805
Gross Unrealized Gains			6
Gross Unrealized Losses			(1)
Fair Value			2,810
Foreign Corporate Debt and Equity Securities [Member]
Summary of Available-For-Sale Securities [Abstract]
Amortized Cost	2,099		15,157
Gross Unrealized Gains	33		41
Gross Unrealized Losses	0		(268)
Fair Value	$ 2,132		$ 14,930

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.

+ References+ Details

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.

+ References+ 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