Other Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Other intangible assets are as follows (in thousands):



	December 31,
	2018				2017
	Cost		Accumulated Amortization		Cost		Accumulated Amortization
Finite lived intangible assets:
Patents and technology	$	18,884	$	6,689	$	9,457	$	3,144
Customer lists	15,367		5,259		15,367		4,505
Trademarks and brand names	1,485		1,149		1,532		1,114
Total finite lived intangible assets acquired	35,736		13,097		26,356		8,763
Deferred financing costs	1,924		496		1,791		96
Total amortizable intangible assets	37,660		$	13,593	28,147		$	8,859
Indefinite lived intangible assets:
Trademarks and brand names	2,760				2,760
Total other intangible assets	$	40,420			$	30,907

Carrying amount:
Other intangible assets, net	$	26,827			$	22,048

Intangible assets acquired are amortized on a straight-line basis over two to 95 years. Amortization of intangible assets acquired totaled $1.4 million, $1.4 million, and $1.5 million for the years end ended December 31, 2018, 2017, and 2016, respectively.

Amortization of deferred financing costs totaled $0.4 million, $0.5 million, and $0.4 million for the years ended December 31, 2018, 2017, and 2016, respectively.

Estimated future amortization expense for other finite lived intangible assets, including deferred financing costs, at December 31, 2018 is as follows (in thousands):



Year ending December 31,
2019	$	2,351
2020	2,324
2021	2,315
2022	2,048
2023	1,821
Thereafter	13,208
Other amortizable intangible assets, net	$	24,067

During the years ended December 31, 2018, 2017, and 2016, no impairments were recognized related to other intangible assets.