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, 2017	$	262,376
Acquisition		86,504
Other		(219	)
Balance at December 31, 2017 before adjustment to conform goodwill to current presentation		348,661
Goodwill associated with Disposition		(29,389	)
Balance at December 31, 2017		319,272
Acquisition		164,976
Other		(664	)
Balance at December 31, 2018	$	483,584

The changes noted as “other” in the table above for both 2018 and 2017 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, 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

						Net
	Gross		Accumulated			Carrying
	Amount		Amortization			Value		Life
As of December 31, 2017:
Customer relationships	$	71,581	$	(6,834	)	$	64,747	7-15 years

The above intangible assets are amortized using the straight-line method. Amortization expense for year ended December 31, 2018 and 2017 was $5.7 million and $3.0 million, respectively. The remaining weighted average life of all definite lived intangible assets as of December 31, 2018 was 11.07 years. Amortization expense for the next five years is as follows (in thousands):

	Total
2019	$	13,822
2020		13,316
2021		12,742
2022		12,700
2023		12,555