In accordance with the FASB issued guidance in the Intangibles-Goodwill and Other Topic of the Codification, we completed the required annual impairment tests. We performed a qualitative assessment on goodwill and determined it was not, more-likely-than-not, that the fair value of our reporting unit was less than its carrying value. There were no accumulated impairment losses of goodwill at the beginning of the period.

	Total
Balance at January 1, 2018	$	319,272
Acquisition		164,976
Other		(664	)
Balance at December 31, 2018		483,584
Acquisition		1,094
Other		(219	)
Balance at December 31, 2019	$	484,459

The changes noted as “other” in the table above for both 2019 and 2018 refer to the amortization of the income tax benefit of tax goodwill in excess of financial statement goodwill and the changes in purchase accounting.

The components of the “Other intangible assets” are as follows (in thousands):

						Net
	Gross		Accumulated			Carrying
	Amount		Amortization			Value		Life
As of December 31, 2019:
Customer relationships	$	144,123	$	(23,517	)	$	120,606	5-15 years

Trade name	$	1,300	$	(939	)	$	361	18 months

Total	$	145,423	$	(24,456	)	$	120,967

							Net
	Gross		Accumulated			Carrying
	Amount		Amortization			Value		Life
As of December 31, 2018:
Customer relationships	$	144,123	$	(10,563	)	$	133,560	5-15 years

Trade name	$	1,300	$	(72	)	$	1,228	18 months

Total	$	145,423	$	(10,635	)	$	134,788

The above intangible assets are amortized using the straight-line method. Amortization expense for year ended December 31, 2019 and 2018 was $13.8 million and $5.7 million, respectively. The remaining weighted average life of all definite lived intangible assets as of December 31, 2019 was 10.02 years. Amortization expense for the next five years is as follows (in thousands):

	Total
Year 1	$	13,316
Year 2		12,742
Year 3		12,700
Year 4		12,555
Year 5		10,960