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4. GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
12 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of activity in goodwill
Balance as of January 1, 2012 (unaudited)  $7,816 
Goodwill acquired through Carroll County Radiology 's acquisition of Westminster from RadNet, Inc.   2,107 
Balance as of December 31, 2012 (unaudited)   9,923 
No goodwill acquired in 2013   
Balance as of December 31, 2013  $9,923 
Schedule of amortization expense
   2014   2015   2016   2017   2018   Thereafter   Total   Weighted average amortization period remaining in years 
                                         
Management service contracts   16    16    16    16    16    195    275    18.0 
Covenant not to compete contracts   104    105    105                314    3.0 
Total annual amortization  $120   $121   $121   $16  $16   $195   $589