Goodwill and other intangible assets

Information regarding the Company’s goodwill and intangible assets as of December 31, 2018 is as follows (in thousands):



	Estimated useful life	Gross carrying amount		Accumulated amortization			Net carrying amount
Customer relationships – retailers	10 years	$	68,800	$	(33,827	)	$	34,973
Customer relationships – e-commerce	3 years	3,900		(3,900		)	—
Total finite-lived intangibles		72,700		(37,727		)	34,973
Trademarks	Indefinite	63,800		—			63,800
Goodwill		157,264		—			157,264
Total goodwill and other intangibles		$	293,764	$	(37,727	)	$	256,037

Information regarding the Company’s goodwill and intangible assets as of December 31, 2017 is as follows (in thousands):



	Estimated useful life	Gross carrying amount		Accumulated amortization			Net carrying amount
Customer relationships – retailers	10 years	$	68,800	$	(26,947	)	$	41,853
Customer relationships – e-commerce	3 years	3,900		(3,875		)	25
Favorable leases, net	Varies	580		(376		)	204
Total finite-lived intangibles		73,280		(31,198		)	42,082
Trademarks	Indefinite	63,800		—			63,800
Goodwill		157,264		—			157,264
Total goodwill and other intangibles		$	294,344	$	(31,198	)	$	263,146

The Company has not recognized any impairment charges on its goodwill or intangible assets, as the anticipated future cash flows generated by each of these assets remain substantially in excess of their carrying values. Amortization expense on the finite-lived intangible assets was $7.1 million for the years ended December 31, 2018 and 2017, and $8.3 million in the year ended December 31, 2016.

The estimated future amortization expense related to the finite-lived intangible assets, assuming no impairment as of December 31, 2018, is as follows (in thousands):



Year ending December 31,
2019	$	6,880
2020	6,880
2021	6,880
2022	6,880
2023	6,880
Thereafter	573
Total	$	34,973