12. Intangible Assets

Intangible assets at December 31, 2019 and 2018 consisted of the following:

N/A – Not Applicable

The impairment tests performed for intangible assets as of July 31, 2019, 2018 and 2017 indicated no impairment charges were required.

Estimated amortization expense for finite-lived intangible assets for each of the five succeeding years is as follows:

In 2019, in connection with the eFront Transaction, the Company acquired $400 million of finite-lived customer relationships, $203 million of finite-lived technology-related intangible assets and $14 million of a finite-lived trade name, with weighted-average estimated lives of approximately 10 years, eight years and four years, respectively. See Note 3, Acquisition, for information on the eFront Transaction.

In 2018, in connection with the TCP and Citibanamex transactions, the Company acquired $145 million and $255 million of indefinite-lived management contracts, respectively, and $48 million and $31 million of finite-lived management contracts, respectively, with a weighted-average estimated life of approximately six and eight years, respectively.