Note 7. Goodwill and Intangible Assets

Goodwill at September 30, 2018 decreased to $56,106,000 from $56,429,000 at December 31, 2017. This $323,000 decrease was due to foreign currency fluctuations. The Company's goodwill is reported in the Golf Clubs and Gear, Accessories and Other operating segments (see Note 17).

In accordance with ASC Topic 350, “Intangibles—Goodwill and Other,” the Company’s goodwill and non-amortizing intangible assets are subject to an annual impairment test or more frequently when impairment indicators are present. There were no impairment charges recognized during the three and nine months ended September 30, 2018. The following sets forth the intangible assets by major asset class (dollars in thousands):



	Useful Life (Years)	September 30, 2018							December 31, 2017
	Useful Life (Years)	Gross		Accumulated Amortization			Net Book Value		Gross		Accumulated Amortization			Net Book Value
Non-Amortizing:
Trade name, trademark and trade dress and other	NA	$	218,364		$	—	$	218,364	$	218,364		$	—	$	218,364
Amortizing:
Patents	2-16	31,581			31,530		51		31,581			31,491		90
Other	1-9	15,780			9,237		6,543		15,780			8,476		7,304
Total intangible assets		$	265,725		$	40,767	$	224,958	$	265,725		$	39,967	$	225,758

Aggregate amortization expense on intangible assets was approximately $266,000 and $159,000 for the three months ended September 30, 2018 and 2017, respectively, and $800,000 and $280,000 for the nine months ended September 30, 2018 and 2017, respectively.

Amortization expense related to intangible assets at September 30, 2018 in each of the next five fiscal years and beyond is expected to be incurred as follows (in thousands):



Remainder of 2018	$	267
2019	1,053
2020	966
2021	910
2022	734
2023	595
Thereafter	2,069
	$	6,594