Goodwill and other intangible assets, net

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and other intangible assets, net

The Company has recorded goodwill in connection with its acquisition of businesses. The following table summarizes the changes in goodwill by operating segment for the three months ended March 31, 2020 (in thousands):



	Drainage Pipe & Products			Water Pipe & Products		Total
Balance at December 31, 2019	$	190,466		$	318,360	$	508,826
Foreign currency and other adjustments	(1,145		)	—		(1,145		)
Balance at March 31, 2020	$	189,321		$	318,360	$	507,681

Intangible assets other than goodwill at March 31, 2020 and December 31, 2019 included the following (in thousands):



	Net carrying value as of March 31, 2020		Net carrying value as of December 31, 2019
Customer relationships	$	93,277	$	100,869
Trade names	18,453		19,626
Patents	7,012		7,673
Non-compete agreements	7,186		8,070
Developed technology	5,887		5,980
Other	437		456
Total intangible assets	$	132,252	$	142,674

Amortization expense totaled $10.3 million for the three months ended March 31, 2020, and $11.6 million for the three months ended March 31, 2019, which is included in selling, general and administrative expenses in the condensed consolidated statements of operations. All of the Company's intangible assets are amortizable.