Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

During the years ended December 31, 2019 and 2018, the change in the carrying amount of goodwill was as follows (in thousands):



Balance at January 1, 2018	$	107,187
Acquisition of Northwest Retail (1)	46,210
Balance at December 31, 2018	153,397
Acquisition of U.S. Oil (1)	42,522
Balance at December 31, 2019	$	195,919

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(1)	Please read Note 4—Acquisitions for further discussion.

Intangible assets consisted of the following (in thousands):



	December 31,
	2019			2018
Intangible assets:
Trade names and trademarks	$	6,267		$	6,267
Customer relationships	32,064			32,064
Other	261			—
Total intangible assets	38,592			38,331
Accumulated amortization:
Trade name and trademarks	(5,124		)	(5,037		)
Customer relationships	(11,919		)	(9,347		)
Other	—			—
Total accumulated amortization	(17,043		)	(14,384		)
Net:
Trade name and trademarks	1,143			1,230
Customer relationships	20,145			22,717
Other	261			—
Total intangible assets, net	$	21,549		$	23,947

Amortization expense was approximately $2.7 million, $2.7 million, and $3.3 million for the years ended December 31, 2019, 2018, and 2017, respectively. Our intangible assets related to customer relationships and trade names have an average useful life of 13.5 years. Expected amortization expense for each of the next five years and thereafter is as follows (in thousands):



Year Ended	Amount
2020	$	2,658
2021	2,658
2022	2,658
2023	2,658
2024	1,400
Thereafter	9,517
	$	21,549