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GOODWILL AND OTHER INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2021
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, 2020 and December 31, 2021 is provided below (in thousands):
Balance as of December 31, 2019$441,973
Goodwill from acquisitions30,906 
Balance as of December 31, 2020$472,879
Goodwill from acquisitions40,864 
Other Adjustments77 
Balance as of December 31, 2021513,820 
 
The amount of goodwill from these acquisitions that is deductible for tax purposes as of December 31, 2021 is $168.8 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 $4.4 million, $3.7 million, and $3.1 million for the years ended December 31, 2021, 2020 and 2019, 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): 
 20222023202420252026ThereafterTotalWeighted average amortization period remaining in years
Management Service Contracts$2,287 $2,287 $2,287 $2,287 $2,287 $11,246 $22,681 9.8
Covenant not to compete and other contracts2,500 2413 1997 1654 989 74 9,627 4.2
Developed Technology461 318 318 318 318 1,432 3,165 9.1
Trade Names amortized88 80 77 77 77 166 565 7.1
Trade Names indefinite life— — — — — 7,100 7,100 — 
Software in development— — — — — 13,465 13,465 — 
Total Annual Amortization$5,336 $5,098 $4,679 $4,336 $3,671 $33,483 $56,603