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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Service fee revenue
   Years Ended December 31, 
   2013   2012   2011 
           (unaudited) 
             
             
Commercial Insurance  $38,846   $40,220   $32,302 
Medicare   12,472    12,089    9,242 
Medicaid   1,945    1,976    1,525 
Workers' Compensation/Personal Injury   2,746    2,615    1,987 
Other   1,201    1,221    1,155 
Service fee revenue, net of contractual allowances and discounts   57,210    58,122   46,212 
                
Provision for bad debts   (2,777)   (2,752)   (2,211)
Net service fee revenue  $54,433   $55,370   $44,001