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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6505594

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 8, 9
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Number 95
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 18
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Number of shares of available-for-sale equity securities acquired during the period.

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Percentage of voting equity interests acquired in the purchase of equity securities classified as available-for-sale.

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- Definition

Fair value, as of the balance sheet date, of potential payments under the contingent consideration arrangement which may include cash and shares.

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FAIR VALUE MEASUREMENTS (Details) (USD $)																		1 Months Ended
FAIR VALUE MEASUREMENTS (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Carrying Value	Dec. 31, 2010 Carrying Value	Jun. 30, 2011 Carrying Value Sanitas ordinary shares	Jun. 30, 2011 Carrying Value Corporate bonds	Dec. 31, 2010 Carrying Value Corporate bonds	Dec. 31, 2010 Carrying Value Government-sponsored enterprise securities	Jun. 30, 2011 Recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2010 Recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1)	Jun. 30, 2011 Recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Sanitas ordinary shares	Jun. 30, 2011 Recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Corporate bonds	Dec. 31, 2010 Recurring basis Significant Other Observable Inputs (Level 2)	Dec. 31, 2010 Recurring basis Significant Other Observable Inputs (Level 2) Corporate bonds	Dec. 31, 2010 Recurring basis Significant Other Observable Inputs (Level 2) Government-sponsored enterprise securities	Jun. 30, 2011 Recurring basis Significant Unobservable Inputs (Level 3)	Dec. 31, 2010 Recurring basis Significant Unobservable Inputs (Level 3)	Jun. 30, 2011 Sanitas ordinary shares	Jun. 30, 2011 Corporate bonds	Dec. 31, 2010 Corporate bonds	Dec. 31, 2010 Government-sponsored enterprise securities
Cash and cash equivalents:
Money market funds			$ 59,842,000	$ 91,448,000					$ 59,842,000	$ 91,448,000
Marketable securities:
Marketable securities	12,124,000	8,166,000	12,124,000	8,166,000	9,170,000	2,954,000	6,340,000	1,826,000			9,170,000	2,954,000	8,166,000	6,340,000	1,826,000			9,170,000	2,954,000	6,340,000	1,826,000
Total financial assets			71,966,000	99,614,000					71,966,000	91,448,000			8,166,000
Liabilities:
Acquisition-related contingent consideration			(420,698,000)	(20,220,000)												(420,698,000)	(20,220,000)
Sanitas ordinary shares
Investment in available-for-sale equity securities																		$ 9,200,000
Number of shares of common stock acquired (in shares)																		660,891
Percentage of outstanding common stock acquired (as a percent)																		2.00%