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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Key members of management	Mar. 31, 2013 Consultants and former owners of acquired businesses Minimum	Mar. 31, 2013 Consultants and former owners of acquired businesses Maximum
Commitments And Contingencies [Line Items]
Usual length of consulting, employment and non-compete agreements			1 year	2 years	5 years
Asset retirement obligation:
Current portion of asset retirement obligations	$ 40	$ 52
Non-current portion of asset retirement obligations	2,628	2,769
Total asset retirement obligations	$ 2,668	$ 2,821

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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