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GOODWILL AND OTHER INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2022
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. The following is a reconciliation of Goodwill by business segment for the years ended December 31, 2021 and December 31, 2022 is provided below (in thousands):
Imaging CenterArtificial IntelligenceTotal
Balance as of December 31, 2020$448,269 $24,610 $472,879 
Additions40,864 — 40,864 
Measurement period and other adjustments77 — 77 
Balance as of December 31, 2021$489,210 $24,610 $513,820 
Additions120,551 48,697 169,248 
Disposals(4,200)— (4,200)
Measurement period and other adjustments(106)147 41 
Currency translation1,028 (2,272)(1,244)
Balance as of December 31, 2022$606,483 $71,182 $677,665 
 
The amount of goodwill from these acquisitions that is deductible for tax purposes as of December 31, 2022 is $154.9 million.
 
Other intangible assets are primarily related to our business combinations and software development. They include the estimated fair values of such items as service agreements, customer lists, covenants not to compete, acquired technologies, and trade names.
 
Total amortization expense was $10.1 million, $4.4 million, and $3.7 million for the years ended December 31, 2022, 2021 and 2020, respectively. 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. Software development is capitalized and amortized over the useful life of the software when placed into service. Trade names are reviewed annually for impairment.

The following tables shows annual amortization expense, by asset classes that will be recorded over the next five years (in thousands): 
20232024202520262027ThereafterTotalWeighted average amortization period remaining in years
Management Service Contracts$2,287 $2,287 $2,287 $2,287 $2,287 $8,958 $20,393 8.9
Covenant not to compete and other contracts1,319 891 642 356 72 40 3,320 3.1
Customer Relationships1,244 1,244 1,112 991 816 12,396 17,803 18.6
Patent and Trademarks298 298 298 298 298 322 1,812 6.4
Developed Technology & Software6,297 6,297 6,297 6,257 5,722 7,196 38,066 6.7
Trade Names amortized305 77 77 77 77 89 702 4.5
Trade Names indefinite life— — — — — 7,100 7,100 — 
IPR&D— — — — — 17,032 17,032 — 
Total Annual Amortization$11,750 $11,094 $10,713 $10,266 $9,272 $53,133 $106,228