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GOODWILL AND OTHER INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2020
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, 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 Health1 
Goodwill acquired through the acquisition of certain assets of West Valley Imaging Center, LLC2,490 
Goodwill disposed through sale of assets(123)
Goodwill acquired by Lenox Hill Radiology through the membership purchase of HVRA3,125 
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, LLC231 
Goodwill acquired through the acquisition of GSRN2,021 
Goodwill acquired through the acquisition of Nulogix1,337 
Goodwill transferred from assets held for sale992 
Balance as of December 31, 2019$441,973
Goodwill acquired through the acquisition of Olney Open MRI, LLC601 
Goodwill acquired through the acquisition of MRI at Woodbridge, LLC1,833 
Goodwill acquired through the acquisition of DeepHealth, Inc.23,299 
Goodwill acquired through the acquisition of AZ-Tech Radiology & Open MRI, LLC2,882 
Goodwill acquired through the acquisition of ZP Ozone Park, LLC828 
Goodwill acquired through the acquisition of ZP Elmhurst LLC1,463 
Balance as of December 31, 2020$472,879
 
The amount of goodwill from these acquisitions that is deductible for tax purposes as of December 31, 2020 is $148.3 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 $3.7 million, $3.1 million, and $2.7 million for the years ended December 31, 2020, 2019 and 2018, 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 table shows annual amortization expense, by asset classes that will be recorded over the next five years (in thousands): 
 20212022202320242025ThereafterTotalWeighted 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 contracts1,024 994 883 467 233 — 3,601 3.9
Developed Technology244 142 — — — — 386 1.6
Trade Names amortized75 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