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5. GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 12 Months Ended
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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

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