The cumulative carrying amount of goodwill was $659.8 million and $653.2 million at March 31, 2021 and December 31, 2020, respectively. Goodwill generally changes due to the timing of acquisitions, finalization of allocation of purchase prices of previous acquisitions and foreign currency translations. The carrying amount of goodwill in foreign countries was $81.3 million at March 31, 2021 and $81.4 million at December 31, 2020.

The Company tests goodwill and indefinite-lived intangible assets as of September 30 each year, or more frequently if indicators of an impairment exist. The Company has concluded there were no indicators of impairment during the three months ended March 31, 2021.

The carrying amount of customer contracts was $297.3 million and $298.9 million at March 31, 2021, and December 31, 2020, respectively. The carrying amount of trademarks and tradenames was $108.8 million and $109.0 million at March 31, 2021 and December 31, 2020, respectively. The carrying amount of other intangible assets was $10.2 million and $10.8 million at March 31, 2021 and December 31, 2020, respectively. The carrying amount of customer contracts in foreign countries was $44.6 million and $45.7 million at March 31, 2021 and December 31, 2020, respectively. The carrying amount of trademarks and tradenames in foreign countries was $3.2 million and $3.3 million at March 31, 2021 and December 31, 2020, respectively. The carrying amount of other intangible assets in foreign countries was $0.9 million and $1.0 million at March 31, 2021 and December 31, 2020, respectively.

Customer contracts and other amortizable intangible assets are amortized on a straight-line basis over their economic useful lives. The following table sets forth the components of indefinite-lived and amortizable intangible assets as of March 31, 2021 (in thousands):