Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

7. Goodwill and Intangible Assets

Goodwill

The change in the carrying amounts of goodwill was as follows by segment (in thousands):

	Commercial		Public Sector		Canada			United Kingdom			Total
Balance at December 31, 2017	$	69,735	$	8,322	$	4,997		$	4,714		$	87,768
Acquisition of Stack Technology		—		—		—			35			35
Acquisition of Provista		—		—		—			78			78
Foreign currency translation		—		—		(388	)		(267	)		(655	)
Balance at December 31, 2018	$	69,735	$	8,322	$	4,609		$	4,560		$	87,226

Intangible Assets

The following table sets forth the amounts recorded for intangible assets (in thousands):

	Weighted Average Estimated		At December 31, 2018							At December 31, 2017
	Useful Lives (years)		Gross Amount			Accumulated Amortization		Net Amount		Gross Amount			Accumulated Amortization		Net Amount
Patent, trademarks, trade names & URLs		5	$	5,304	(1)	$	1,502	$	3,802	$	7,739	(1)	$	3,186	$	4,553
Customer relationships		14		13,460			9,358		4,102		13,533			7,799		5,734
Non-compete agreements		4		2,087			1,888		199		2,377			1,574		803
Total intangible assets			$	20,851		$	12,748	$	8,103	$	23,649		$	12,559	$	11,090

(1) Included in the total amount for “Patent, trademarks & URLs” are $2.9 million of trademarks with indefinite useful lives that are not amortized.

Amortization expense for intangible assets was $3.0 million, $4.1 million and $5.8 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Estimated amortization expense for intangible assets in each of the next five years and thereafter, as applicable, as of December 31, 2018 was as follows: $1.9 million in 2019, $1.3 million in 2020, $0.5 million in 2021, $0.4 million in 2022, $0.3 million in 2023 and $0.8 million thereafter.