SIGNIFICANT ACCOUNTING POLICIES (Employee Related Benefits) (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Severance expense	$ 2,878,000	$ 3,732,000	$ 2,317,000
Description of defined contribution plan	U.S employees may contribute up to 100% of their pretax salary, but not more than statutory limits. Generally, the Group contributes one dollar for each dollar a participant contributes in this plan, in an amount of up to 3% of salary and in addition, it contributes fifty cents for each dollar a participant contributes in this plan, for an additional 3%.
Employer contributions to benefit plan per dollar contributed by employee	1
Employer match percentage	3.00%
Additional employer contributions to benefit plan per dollar contributed by employee	0.5
Contributions to employee benefits plan	$ 906,000	$ 1,230,000	$ 610,000
Additional employer matching percentage	3.00%

SIGNIFICANT ACCOUNTING POLICIES (Employee Related Benefits) (Details) (USD $)

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Severance expense

$ 2,878,000

$ 3,732,000

$ 2,317,000

Description of defined contribution plan

U.S employees may contribute up to 100% of their pretax salary, but not more than statutory limits. Generally, the Group contributes one dollar for each dollar a participant contributes in this plan, in an amount of up to 3% of salary and in addition, it contributes fifty cents for each dollar a participant contributes in this plan, for an additional 3%.

Employer contributions to benefit plan per dollar contributed by employee

Employer match percentage

3.00%

Additional employer contributions to benefit plan per dollar contributed by employee

0.5

Contributions to employee benefits plan

$ 906,000

$ 1,230,000

$ 610,000

Additional employer matching percentage

3.00%

- Definition

Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented.

+ References+ Details

- Definition

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 146

-Paragraph 8-13, 20

-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

-Name Accounting Standards Codification

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

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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 Accounting Standards Codification

-Topic 230

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-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 112

-Paragraph 7

-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 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS146-1

-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.

+ Details