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FAIR VALUE MEASUREMENTS (Details) (Recurring basis, USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Quoted Prices in Active Markets (Level 1)
Fair value measurements
Assets measured at fair value	$ 2,779	$ 3,847
Quoted Prices in Active Markets (Level 1) | Money market funds
Fair value measurements
Assets measured at fair value	2,779	3,847
Significant Other Observable Inputs (Level 2)
Fair value measurements
Assets measured at fair value	3,360	3,366
Liabilities measured at fair value	11,037	11,337
Significant Other Observable Inputs (Level 2) | Interest rate derivative
Fair value measurements
Liabilities measured at fair value	11,037	11,337
Significant Other Observable Inputs (Level 2) | Certificates of deposit
Fair value measurements
Assets measured at fair value	3,360	3,366
Total
Fair value measurements
Assets measured at fair value	6,139	7,213
Liabilities measured at fair value	11,037	11,337
Total | Interest rate derivative
Fair value measurements
Liabilities measured at fair value	11,037	11,337
Total | Certificates of deposit
Fair value measurements
Assets measured at fair value	3,360	3,366
Total | Money market funds
Fair value measurements
Assets measured at fair value	$ 2,779	$ 3,847

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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Period Type:	instant

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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Balance Type:	credit
Period Type:	instant