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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill and Other Intangible Assets | Activity in goodwill for the years ended December 31, 2019 and December 31, 2020 is provided below (in thousands):
Balance as of December 31, 2018 | $418,093
Adjustments to our preliminary allocation of the purchase price of Medical Arts Radiological Group, P.C. | 722 |
Goodwill acquired through the acquisition of certain assets of Dignity Health | 1 |
Goodwill acquired through the acquisition of certain assets of West Valley Imaging Center, LLC | 2,490 |
Goodwill disposed through sale of assets | (123) |
Goodwill acquired by Lenox Hill Radiology through the membership purchase of HVRA | 3,125 |
Goodwill acquired through the acquisition of certain assets of Kern Radiology, Inc. | 10,507 |
Goodwill acquired through the acquisition of certain assets of Zilkha Radiology, Inc. | 2,577 |
Goodwill acquired through the acquisition of certain assets of Ramic Mahwah, LLC | 231 |
Goodwill acquired through the acquisition of GSRN | 2,021 |
Goodwill acquired through the acquisition of Nulogix | 1,337 |
Goodwill transferred from assets held for sale | 992 |
Balance as of December 31, 2019 | $441,973
Goodwill acquired through the acquisition of Olney Open MRI, LLC | 601 |
Goodwill acquired through the acquisition of MRI at Woodbridge, LLC | 1,833 |
Goodwill acquired through the acquisition of DeepHealth, Inc. | 23,299 |
Goodwill acquired through the acquisition of AZ-Tech Radiology & Open MRI, LLC | 2,882 |
Goodwill acquired through the acquisition of ZP Ozone Park, LLC | 828 |
Goodwill acquired through the acquisition of ZP Elmhurst LLC | 1,463 |
Balance as of December 31, 2020 | $472,879
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):
| 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Thereafter |  | Total |  | Weighted average amortization period remaining in years
Management Service Contracts | $ | 2,287 |  |  | $ | 2,287 |  |  | $ | 2,287 |  |  | $ | 2,287 |  |  | $ | 2,287 |  |  | $ | 13,533 |  |  | $ | 24,968 |  |  | 10.9
Covenant not to compete and other contracts | 1,024 |  |  | 994 |  |  | 883 |  |  | 467 |  |  | 233 |  |  | — |  |  | 3,601 |  |  | 3.9
Developed Technology | 244 |  |  | 142 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 386 |  |  | 1.6
Trade Names amortized | 75 |  |  | 75 |  |  | 66 |  |  | 64 |  |  | 64 |  |  | 309 |  |  | 653 |  |  | 5.4
Trade Names indefinite life | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7,100 |  |  | 7,100 |  |  | — |
Software in development | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 15,685 |  |  | 15,685 |  |  | — |
Total Annual Amortization | $ | 3,630 |  |  | $ | 3,498 |  |  | $ | 3,236 |  |  | $ | 2,818 |  |  | $ | 2,584 |  |  | $ | 36,627 |  |  | $ | 52,393 |  |  |

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