During the nine months ended December 31, 2021, the increase in the Company’s goodwill primarily related to the acquisitions of the remaining 51% interest in EBI and of RigNet on April 30, 2021 (see Note 12 – Acquisitions for more information) and a foreign currency translation effect recorded within all three of the Company’s segments. During the nine months ended December 31, 2020, the increase in the Company’s goodwill related to the effects of foreign currency translation recorded within all three of the Company’s segments.

Other acquired intangible assets are amortized using the straight-line method over their estimated useful lives of two to 20 years (which approximates the economic pattern of benefit). Amortization expense related to other acquired intangible assets was $7.5 million and $1.3 million for the three months ended December 31, 2021 and 2020, respectively, and $20.9 million and $4.2 million for the nine months ended December 31, 2021 and 2020, respectively.

The expected amortization expense of amortizable acquired intangible assets may change due to the effects of foreign currency fluctuations as a result of international businesses acquired. The current and expected amortization expense for acquired intangible assets for each of the following periods is as follows:


	Amortization
	(In thousands)
For the nine months ended December 31, 2021	$	20,859

Expected for the remainder of fiscal year 2022	$	7,532
Expected for fiscal year 2023		30,128
Expected for fiscal year 2024		28,678
Expected for fiscal year 2025		26,540
Expected for fiscal year 2026		26,388
Thereafter		118,584
	$	237,850

In the first quarter of fiscal year 2022, the gross amount and accumulated amortization for acquired identifiable intangible assets were reduced by the retirement of fully amortized assets that were no longer in use.