							Initial
	April 4,			December 28,			Useful Life
	2020			2019			(in years)
	(in thousands)
Goodwill	$	323,800		$	277,600		indefinite

Other intangible assets:
Trade names (indefinite-lived)	$	148,841		$	148,841		indefinite

Customer relationships and customer-related assets		201,547			200,647		<1-10
Trade name (amortizable)		23,500			-		15
Developed technology		5,600			3,000		6-10
Non-compete agreement		3,338			1,668		2-5
Software license		590			590		2
Less: Accumulated amortization		(103,526	)		(98,784	)

Subtotal		131,049			107,121

Other intangible assets, net	$	279,890		$	255,962

Goodwill at December 28, 2019	$	277,600
Increase related to the acquisition of NewSouth		46,200

Goodwill at April 4, 2020	$	323,800

Estimated amortization of our amortizable intangible assets for future years is as follows:

Amortization expense for relating to amortizable intangible assets for the three months ended April 4, 2020, and March 30, 2019, was $4.7 million and $4.0 million, respectively.

We perform our annual goodwill and indefinite-lived intangible asset impairment testing on the first day of our fiscal fourth quarter of each year, and at interim periods if needed based on occurrence of triggering events. Given the general deterioration in economic and market conditions surrounding the COVID-19 pandemic, and the narrow excess fair value over carrying value of its WinDoor and WWS trade names as described in our 2019 Form 10-K, the Company determined it should complete interim impairment tests of its WinDoor and WWS trade names as of April 4, 2020.

Although these interim impairment tests did not indicate that impairments of those assets exist at this time, due to earlier and stricter stay-at-home orders relating to the COVID-19 pandemic in the western states, WWS reporting unit sales could decrease further or for longer than we currently forecast, which would result in an impairment if such decrease in sales were to occur. Our modeling has indicated that if sales of our WWS reporting unit decrease to approximately $133 million in 2020, assuming a long-term compound average growth rate of 7% thereafter, with a terminal growth rate of 3%, the $73.0 million carrying value of our WWS trade name would exceed it fair value by approximately $6 million. However, if WWS achieves 2020 net sales that are flat to prior year and returns to growth assumptions for 2021 and beyond, as modeled in our 2019 annual impairment test, which includes a terminal growth rate of 3%, then no impairment is indicated. A key assumption in our modeling is an assessment of macro industry growth in our WWS reporting unit’s key markets.