Goodwill amounts by reporting unit are summarized as follows:



	Goodwill at		Acquisitions ⁽¹⁾		Dispositions		Other⁽²⁾			Goodwill at
	December 30, 2017		Acquisitions ⁽¹⁾		Dispositions		Other⁽²⁾			June 30, 2018
United States	$	586,437	$	164	$	—	$	—		$	586,601
Canada	30,372		—		—		(1,438		)	28,934
Mexico	3,694		—		—		(11		)	3,683
Total	$	620,503	$	164	$	—	$	(1,449	)	$	619,218


(1)	These amounts relate to the adjustments to the opening balance sheet for the acquisition of ST Fastening Systems ("STFS"). STFS was acquired in the fourth quarter of 2017.


(2)	These amounts relate to adjustments resulting from fluctuations in foreign currency exchange rates.

Other intangibles, net, as of June 30, 2018 and December 30, 2017 consist of the following:



	Estimated Useful Life (Years)	June 30, 2018		December 30, 2017
Customer relationships	13-20	$	701,898	$	703,399
Trademarks - All Others	Indefinite	85,443		85,759
Trademarks - TagWorks	5	300		300
KeyWorks license	7	4,443		4,455
Patents	7-12	31,908		31,941
Intangible assets, gross		823,992		825,854
Less: Accumulated amortization		151,786		132,659
Other intangibles, net		$	672,206	$	693,195

The amortization expense for amortizable assets including the adjustments resulting from fluctuations in foreign currency exchange rates was $9,712 and $19,435 for the thirteen and twenty-six weeks ended June 30, 2018 and $9,470 and $18,942 for the thirteen and twenty-six weeks ended July 1, 2017.

The Company tests goodwill and indefinite-lived intangible assets for impairment annually. Impairment is also tested when events or changes in circumstances indicate that the carrying values of the assets may be greater than their fair values. During the thirteen and twenty-six weeks ended June 30, 2018 and thirteen and twenty-six weeks ended July 1, 2017, the Company did not adjust goodwill or intangible assets to their fair values as a result of any impairment analyses.

In 2017, the fair value of each reporting unit except the United States was in excess of its carrying value by more than 10%. In 2017, the fair value of United States reporting unit exceeded its carrying value by approximately 4%. A 100 basis point decrease in the projected long-term growth rate or a 100 basis point increase in the discount rate for this reporting unit could decrease the fair value by enough to result in some impairment based on the current forecast model. Future declines in the market and deterioration in earnings could lead to a potential impairment.