Note 9  Intangible Assets and Goodwill Intangible Assets The fair values of intangible assets recognized as the result of title insurance agency acquisitions, all Level 3 inputs, are principally based on values obtained from a third-party valuation service. In accordance with ASC 350, Intangibles  Goodwill and Other , management determined that no events or changes in circumstances occurred during 2018 that would indicate the carrying amounts may not be recoverable, and therefore determined that no identifiable intangible assets were impaired during the three months ended March 31, 2018 . Net identifiable intangible assets of $154 thousand were impaired during 2017. Identifiable intangible assets consist of the following as of March 31, 2018 and December 31, 2017 : (in thousands) 2018 2017 Referral relationships $ 6,416 $ 6,416 Non-compete agreements 1,406 1,406 Tradename 560 560 Total 8,382 8,382 Accumulated amortization (1,556 ) (1,375 ) Identifiable intangible assets, net $ 6,826 $ 7,007 The following table provides the estimated aggregate amortization expense for each of the five succeeding fiscal years: Year Ended (in thousands) 2018 $ 397 2019 569 2020 569 2021 562 2022 525 Thereafter 4,204 Total $ 6,826 Goodwill and Title Plant As of March 31, 2018 , the Company recognized $4.4 million in goodwill and $690 thousand in a title plant, net of impairments, as the result of title insurance agency acquisitions. The title plant is included with other assets in the Consolidated Balance Sheets. The fair values of goodwill and the title plant, both Level 3 inputs, are principally based on values obtained from a third-party valuation service. In accordance with ASC 350, Intangibles  Goodwill and Other , management determined that no events or changes in circumstances occurred during 2018 that would indicate the carrying amounts may not be recoverable, and therefore determined that neither goodwill nor the title plant were impaired during the three months ended March 31, 2018 . Goodwill of $29 thousand was impaired