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Note 7 - Goodwill and Other Acquired Intangible Assets, Net (Notes)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Other Acquired Intangible Assets, Net
All of our goodwill and other acquired intangible assets relate to our Real Estate segment. The following table shows the changes in the carrying amount of goodwill as of and for the years ended December 31, 2020 and 2019.
(In thousands)GoodwillAccumulated Impairment LossesNet
Balance at December 31, 2018$200,561 $(186,469)$14,092 
Goodwill acquired538 — 538 
Impairment losses— (4,828)(4,828)
Balance at December 31, 2019201,099 (191,297)9,802 
Goodwill disposed (1)
(191,297)191,297 — 
Balance at December 31, 2020$9,802 $— $9,802 
(1)Related to the sale of Clayton in January 2020.
The following is a summary of the gross and net carrying amounts and accumulated amortization (including impairment) of our other acquired intangible assets as of the periods indicated.
December 31, 2020 December 31, 2019
(In thousands)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Client relationships$43,550 $(31,559)$11,991 $43,550 $(27,269)$16,281 
Technology8,285 (7,370)915 8,435 (6,789)1,646 
Licenses 463 (128)335 463 (81)382 
Trade names and trademarks480 (480)— 480 (404)76 
Total$52,778 $(39,537)$13,241 $52,928 $(34,543)$18,385 

For the years ended December 31, 2020, 2019 and 2018, amortization expense (including impairment) was $5.1 million, $8.6 million and $12.4 million, respectively. The estimated amortization expense for 2021 and thereafter is as follows.
(In thousands)Estimated Amortization Expense
2021$3,450 
20223,397 
20233,361 
20243,033 
Thereafter— 
Total$13,241 

Impairment Analysis
As part of our 2020 annual goodwill impairment assessment performed during the fourth quarter, we estimated the fair value of the reporting unit using primarily an income approach. The key factor in our fair value analysis was forecasted future cash flows. We considered both positive and negative factors and concluded that, after considering all of the factors and evidence available, there was no impairment of goodwill indicated as of the measurement date because the estimated fair value of the reporting unit exceeded our carrying amount.
Based primarily on the wind down of the traditional appraisal business, as of December 31, 2020, we also evaluated the recoverability of certain asset groups in the fourth quarter, including other acquired intangible assets. Based on our analysis, we recognized an impairment of client relationships of $1.0 million and technology of $0.3 million as of December 31, 2020. There was no impairment indicated for the remaining other acquired intangible assets.
Clayton Sale
In January 2020, we completed the sale of Clayton, through which we provided mortgage services related to loan acquisition, RMBS securitization and distressed asset reviews and servicer and loan surveillance services. We determined that the asset group associated with the sale of Clayton met the criteria to be reclassified as held for sale as of December 31, 2019 and recognized an impairment charge of $4.8 million for goodwill allocated to this asset group. In addition, we recognized an impairment of other acquired intangible assets for $13.7 million and reclassified the remaining other acquired intangible assets balance associated with the asset group of $3.7 million as held for sale as of December 31, 2019.
Assets and liabilities related to Clayton classified as held for sale are presented in other assets and other liabilities, respectively, in the consolidated balance sheets in the period in which the business was classified as held for sale as of December 31, 2019.