COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Key members of management	Dec. 31, 2012 Consultants and former owners of acquired businesses Minimum	Dec. 31, 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
Asset retirement obligation:
Current portion of asset retirement obligations	$ 52	$ 301
Non-current portion of asset retirement obligations	2,769	2,507
Total asset retirement obligations	$ 2,821	$ 2,808