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COMMITMENTS AND CONTINGENCIES Leases of property and equipment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]      
Operating Leases, Rent Expense $ 1,028 $ 871 $ 662
Operating Leases, Future Minimum Payments Due, 2013 880    
Operating Leases, Future Minimum Payments Due, 2014 539    
Operating Leases, Future Minimum Payments Due, 2015 365    
Operating Leases, Future Minimum Payments Due, 2016 205    
Operating Leases, Future Minimum Payments Due, 2017 149    
Operating Leases, Future Minimum Payments Due, 2018 and Thereafter 242    
Operating Leases, Future Minimum Payments Due $ 2,380