COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Key members of management	Sep. 30, 2012 Consultants and former owners of acquired businesses Minimum	Sep. 30, 2012 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
Income taxes appeal matters:
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 3,600
Asset retirement obligation:
Current portion of asset retirement obligations	153	301
Non-current portion of asset retirement obligations	2,634	2,507
Total asset retirement obligations	$ 2,787	$ 2,808