Goodwill

We perform our annual goodwill impairment test as of the first day of the fourth quarter. If certain factors occur, including significant under performance of our business relative to expected operating results, significant adverse economic and industry trends, significant decline in our market capitalization for an extended period of time relative to net book value, a decision to divest individual businesses within a reporting unit, or a decision to group individual businesses differently, we may perform an impairment test prior to the fourth quarter. In addition, we early adopted ASU 2017-04 on January 1, 2019 which simplified our goodwill impairment testing by eliminating Step Two of the goodwill impairment test. See Note 1.

We acquired Certified Thermoplastics Co., LLC (“CTP”) in April 2018 and recorded goodwill of $18.6 million in our Structural Systems segment. Since a goodwill impairment analysis is required to be performed within one year of the acquisition date or sooner upon a triggering event, we performed a Step One goodwill impairment analysis as of April 2019 for our Structural Systems segment. The fair value of our Structural Systems segment exceeded its carrying value by 85% and thus, was not deemed impaired.

The carrying amounts of our goodwill were as follows:




	Electronic Systems			Structural Systems		Consolidated Ducommun
Gross goodwill	$	199,157		$	18,622	$	217,779
Accumulated goodwill impairment	(81,722		)	—		(81,722		)
Balance at December 31, 2018	$	117,435		$	18,622	$	136,057
Balance at September 28, 2019	$	117,435		$	18,622	$	136,057