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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill and other intangible assets | Activity in goodwill for the years ended December 31, 2017 and 2018 is provided below (in thousands):
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 |
Goodwill acquired through the acquisition of Imaging Services Company of New York, LLC | 2,692 |
Goodwill acquired through the acquisition of certain assets of MemorialCare Medical Foundation | 545 |
Goodwill transferred to assets held for sale | (1,059 | )
Goodwill acquired through the acquisition of Women's Imaging Specialists in Healthcare | 4,268 |
Goodwill acquired through the acquisition of Valley Metabolic Imaging | 1,469 |
Goodwill acquired through the acquisition of Sierra Imaging Associates | 1,147 |
Goodwill disposed through the sale of plastic surgery unit | (80 | )
Goodwill acquired through the acquisition of Washington Heights Medical Management | 2,303 |
Goodwill acquired through the acquisition of Medical Arts Radiological Group, P.C. | 41,469 |
Goodwill acquired through the acquisition of Arcadia Radiology Imaging Services, LLC | 2,582 |
Goodwill acquired through the acquisition of Southern California Diagnostic Imaging, Inc. | 41 |
Goodwill acquired through the acquisition of Orange County Diagnostics Imaging Center, Inc. | 3,618 |
Goodwill acquired through assuming operational control of New Jersey Imaging Network, LLC | 106,122 |
Goodwill impaired in the Imaging On Call reporting unit | (3,800 | )
Balance as of December 31, 2018 | $418,093
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):
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |  | Total |  | Weighted average amortization period remaining in years
Management Service Contracts | 2,287 |  |  | 2,287 |  |  | 2,287 |  |  | 2,287 |  |  | 2,287 |  |  | 18,108 |  |  | 29,543 |  |  | 12.9 |
Covenant not to compete contracts | 376 |  |  | 301 |  |  | 240 |  |  | 210 |  |  | 98 |  |  | — |  |  | 1,225 |  |  | 3.9 |
Trade Names amortized | 11 |  |  | 11 |  |  | 11 |  |  | 11 |  |  | 9 |  |  | — |  |  | 53 |  |  | 5.0 |
Trade Names indefinite life | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 9,772 |  |  | 9,772 |  |  | — |
Total Annual Amortization | 2,674 |  |  | 2,599 |  |  | 2,538 |  |  | 2,508 |  |  | 2,394 |  |  | 27,880 |  |  | 40,593 |  |  |
* These trade name intangibles have an indefinite life

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