Goodwill and Other Intangible Assets

Goodwill

There were no changes in the carrying amount of goodwill during the three months ended March 31, 2019 and 2018. Goodwill is reviewed annually for impairment and more frequently if potential impairment indicators exist. No impairment indicators were identified during the three months ended March 31, 2019 and 2018. All of the Company's goodwill is associated with the Property and Casualty business segment (See Note 14. Segment Information for additional information on the reportable business segment).

Other Intangible Assets

The following table presents the components of other intangible assets:



	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Useful Lives

	(Amounts in thousands)							(in years)
As of March 31, 2019:
Customer relationships	$	53,212	$	(48,998	)	$	4,214	11
Trade names	15,400		(6,577		)	8,823		24
Technology	4,300		(4,300		)	—		10
Insurance license	1,400		—			1,400		Indefinite
Total other intangible assets, net	$	74,312	$	(59,875	)	$	14,437

As of December 31, 2018:
Customer relationships	$	53,048	$	(47,897	)	$	5,151	11
Trade names	15,400		(6,417		)	8,983		24
Technology	4,300		(4,300		)	—		10
Insurance license	1,400		—			1,400		Indefinite
Total other intangible assets, net	$	74,148	$	(58,614	)	$	15,534

Other intangible assets are reviewed annually for impairment and more frequently if potential impairment indicators exist. No impairment indicators were identified during the three months ended March 31, 2019 and 2018.

Other intangible assets with definite useful lives are amortized on a straight-line basis over their useful lives. Other intangible assets amortization expense was $1.3 million and $1.4 million for the three months ended March 31, 2019 and 2018, respectively.

The following table presents the estimated future amortization expense related to other intangible assets as of March 31, 2019:



Year	Amortization Expense
	(Amounts in thousands)
Remainder of 2019	$	3,802
2020	922
2021	902
2022	878
2023	714
Thereafter	5,819
Total	$	13,037