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5. PROPERTY AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property and equipment and accumulated depreciation and amortization
   December 31, 
   2013   2012 
         
         
Medical equipment  $34,190   $31,804 
Office equipment, furniture and fixtures   3,206    2,949 
Leasehold improvements   14,589    14,253 
Equipment under capital leases   1,982    1,982 
    53,967    50,988 
Accumulated depreciation and amortization   (36,173)   (31,630)
   $17,794   $19,358