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GOODWILL AND OTHER INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND OTHER INTANGIBLE ASSETS | GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill is recorded as a result of business combinations. 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
The amount of goodwill from these acquisitions that is deductible for tax purposes as of December 31, 2018 is $160.1 million. Other intangible assets are primarily related to the value of management service agreements obtained through our acquisition of Radiologix, Inc. in 2006 and are recorded at a cost of $57.5 million less accumulated amortization of $28.0 million at December 31, 2018. Also included in other intangible assets is the value of covenant not to compete contracts associated with our facility acquisitions totaling $7.7 million less valuation adjustments and accumulated amortization of $6.4 million, as well as the value of trade names associated with acquired imaging facilities totaling $12.1 million less accumulated amortization of $1.5 million and dispositions and impairments totaling $887,000. Total amortization expense was $2.7 million for the year ended December 31, 2018 and $2.6 million for each of the years ended December 31, 2017 and 2016. Intangible assets are amortized using the straight-line method over their useful life determined at acquisition. Management service agreements are amortized over 25 years using the straight line method. 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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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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