GOODWILL AND OTHER INTANGIBLE ASSETS, NET

A reconciliation of the change in the carrying amount of goodwill by reportable segment is as follows:



	Diversified Industrial			Energy			Financial Services		Corporate and Other		Total
Balance as of December 31, 2019
Gross goodwill	$	180,855		$	67,143		$	6,515	$	81	$	254,594
Accumulated impairments	(40,178		)	(64,790		)	—		—		(104,968		)
Net goodwill	140,677			2,353			6,515		81		149,626
Acquisitions ^(a)	2,300			—			—		—		2,300
Currency translation adjustments	(5		)	—			—		—		(5		)
Balance as of March 31, 2020
Gross goodwill	183,150			67,143			6,515		81		256,889
Accumulated impairments	(40,178		)	(64,790		)	—		—		(104,968		)
Net goodwill	$	142,972		$	2,353		$	6,515	$	81	$	151,921


(a)	Related to the acquisition of Metallon. See Note 4 - "Acquisitions."

A summary of Other intangible assets, net is as follows:



	March 31, 2020						December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Customer relationships	$	213,610	$	110,348	$	103,262	$	216,428	$	109,701	$	106,727
Trademarks, trade names and brand names	51,094		18,667		32,427		51,414		18,469		32,945
Developed technology, patents and patent applications	32,012		17,610		14,402		31,984		17,176		14,808
Other	18,760		15,102		3,658		17,963		13,850		4,113
Total	$	315,476	$	161,727	$	153,749	$	317,789	$	159,196	$	158,593

Trademarks with indefinite lives as of both March 31, 2020 and December 31, 2019 were $11,320. Amortization expense related to intangible assets was $5,282 and $5,265 for the three months ended March 31, 2020 and 2019, respectively. As a result of COVID-19 related declines in our youth sports business within the Energy segment, intangible assets of $617, primarily customer relationships, were fully impaired during the quarter ended March 31, 2020. The impairment is included in Asset impairment charges in the accompanying statement of operations for the three months ended March 31, 2020.

As of March 31, 2020, the Company reviewed its goodwill, other intangible assets and long-lived assets for indicators of impairment as a result of the impact of the COVID-19 pandemic. As a result of the COVID-19 pandemic, the Company believes that indicators of impairment were present for all these asset classes due to a general deterioration in macroeconomic conditions, reduced cash flow projections and a significant decline in the Company's market capitalization. Therefore, we assessed whether it was more likely than not that our goodwill, other intangible assets and long-lived assets were impaired as of March 31, 2020. We reviewed our previous forecasts and assumptions based on our current projections that are subject to various risks and uncertainties, including forecasted revenues, expenses and cash flows, including the duration and extent of impact to our businesses from the COVID-19 pandemic and the reduction in the Company's market capitalization. Based on our interim impairment assessment as of March 31, 2020, we have determined that our goodwill, other intangible assets, except for our youth sports related intangibles described above, and long-lived assets are not impaired. However, as a result of the COVID-19 pandemic, it is possible in future periods that further declines in market conditions, customer demand or other potential changes in operations may increase the risk that these assets are impaired. In addition, at March 31, 2020, the goodwill related to the performance materials business, within our Diversified Industrial segment, is at risk of future impairment if the fair value of this reporting unit, and its associated assets, decrease in value due to further declines in market conditions or customer demand. The goodwill related to our energy business within our Energy segment is also at risk of future impairment if the fair value of this reporting unit, and its associated assets, decrease in value due to reductions in customer demand as a result of continued or sustained declines in the price of oil. See Note 21 - "Subsequent Events" for further discussion.