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5. GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill and other intangible assets

Goodwill is recorded as a result of business combinations. Activity in goodwill for the years ended December 31, 2016 and 2017 is provided below (in thousands):

  

Balance as of December 31, 2015   $ 239,408  
Goodwill acquired through the acquisition of Advanced Radiological Imaging     1,280  
Adjustments to our preliminary allocation of the purchase price of Diagnostic Imaging Group, LLC     (47 )
Goodwill acquired through the acquisition of Landmark Imaging, LLC     38  
Goodwill held for sale     (1,126 )
Balance as of December 31, 2016     239,553  
Goodwill acquired through the acquisition of Resolution Imaging Medical Corp     1,901  
Goodwill acquired through the acquisition of MRI Centers Inc.     401  
Goodwill disposed through the transfer to Santa Monica Imaging Group JV     (1,901 )
Goodwill acquired through the acquisition of D&D Diagnostics, Inc.     1,519  
Goodwill acquired through the acquisition of Stockton MRI, Inc.     3,101  
Goodwill disposed through the sale of Hematology Oncology     (110 )
Goodwill acquired through the acquisition of DIA, Inc.     9,185  
Goodwill disposed through the sale of Breastlink Medical Group, Inc.     (509 )
Goodwill acquired through the acquisition of RDI, Inc.     1,202  
Adjustments to our preliminary allocation of the purchase price of DIA, Inc.     1,058  
Goodwill acquired through the acquisition of RadSite, LLC     1,665  
Goodwill transferred to other assets     (289 )
Balance as of December 31, 2017   $ 256,776  
Schedule of annual amortization expense

The following table shows annual amortization expense, by asset classes that will be recorded over the next five years (in thousands):

  

    2018     2019     2020     2021     2022     Thereafter     Total     Weighted average amortization period remaining in years  
                                                 
Management Service Contracts   $ 2,287     $ 2,287     $ 2,287     $ 2,287     $ 2,287     $ 20,396     $ 31,831       13.9  
Covenant not to compete contracts     279       199       119       43       14       –       654       2.8  
Trade Names*     –       –       –       –       –       7,937       7,937       –  
Total Annual Amortization   $ 2,566     $ 2,486     $ 2,406     $ 2,330     $ 2,301     $ 28,333     $ 40,422          

 

* These trade name intangibles have an indefinite life