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6. INVESTMENT IN JOINT VENTURES (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investment in joint ventures
Investment in joint ventures at December 31, 2011	$ 26,582	$ 22,326
Fair value of remaining interest in de-consolidated joint venture (see Note 2)	1,936
Initial investment in joint venture imaging center located in Cedar Knolls, New Jersey (see Note 2)	1,836
Additional investment in an existing joint venture imaging center	920
Final purchase accounting adjustment to the fair value of joint venture interests acquired with our acquisition of Raven Holdings (see Note 2)	933
Equity in earnings of joint ventures for the nine months ended September 30, 2012	4,157
Distributions from joint ventures received during the nine months ended September 30, 2012	(5,526)
Investment in joint ventures at September 30, 2012	$ 26,582	$ 22,326

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Final Purchase Accounting Adjustment To Fair Value Of Joint Venture Interests Acquired With Our Acquisition

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Initial investment in joint venture

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Total investments in (A) an entity in which the company has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method. Investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, (C) an entity in which the reporting entity shares control of the entity with another party or group, and (D) an entity in which the company has significant influence, but does not have control.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 33

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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