Goodwill — Goodwill by operating segment as of September 30, 2023 and changes for the nine months then ended are as follows (in thousands):


	Completion		Drilling
	Services		Products		Total
Balance at beginning of period	$	—	$	—	$	—
Goodwill acquired		921,656		451,341		1,372,997
Balance at end of period	$	921,656	$	451,341	$	1,372,997

Goodwill is evaluated at least annually or when circumstances require, to determine if the fair value of recorded goodwill has decreased below its carrying value. For impairment testing purposes, goodwill is evaluated at the reporting unit level. Our reporting units for impairment testing are our operating segments. We determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value after considering qualitative, market and other factors, and if this is the case, any necessary goodwill impairment is determined using a quantitative impairment test. From time to time, we may perform quantitative testing for goodwill

impairment in lieu of performing the qualitative assessment. If the resulting fair value of goodwill is less than the carrying value of goodwill, an impairment loss would be recognized for the amount of the shortfall.

Intangible Assets — The following table presents the gross carrying amount and accumulated amortization of our intangible assets as of September 30, 2023 and December 31, 2022 (in thousands):


	September 30, 2023							December 31, 2022
	Gross					Net		Gross					Net
	Carrying		Accumulated			Carrying		Carrying		Accumulated			Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	785,866	$	(7,915	)	$	777,951	$	1,800	$	(1,071	)	$	729
Developed technology		202,772		(6,404	)		196,368		7,772		(3,773	)		3,999
Trade name		101,000		(1,083	)		99,917		—		—			—
Other		1,352		(630	)		722		1,450		(333	)		1,117
Intangible assets, net	$	1,090,990	$	(16,032	)	$	1,074,958	$	11,022	$	(5,177	)	$	5,845

Amortization expense on intangible assets of approximately $10.1 million and $0.3 million was recorded in the three months ended September 30, 2023 and 2022, respectively. Amortization expense on intangible assets of approximately $10.9 million and $1.0 million was recorded in the nine months ended September 30, 2023 and 2022, respectively.