Other Intangible Assets

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Other intangible assets are as follows (in thousands):



	December 31,
	2019				2018
	Cost		Accumulated Amortization		Cost		Accumulated Amortization
Finite lived intangible assets:
Patents and technology	$	17,493	$	6,715	$	18,884	$	6,689
Customer lists	15,367		6,013		15,367		5,259
Trademarks and brand names	1,351		1,160		1,485		1,149
Total finite lived intangible assets acquired	34,211		13,888		35,736		13,097
Deferred financing costs	—		—		1,924		496
Total amortizable intangible assets	34,211		$	13,888	37,660		$	13,593
Indefinite lived intangible assets:
Trademarks and brand names	2,760				2,760
Total other intangible assets	$	36,971			$	40,420

Carrying amount:
Other intangible assets, net	$	23,083			$	26,827

Intangible assets acquired are amortized on a straight-line basis over two to 95 years. Amortization of intangible assets acquired totaled $2.0 million, $1.4 million, and $1.5 million for the years end ended December 31, 2019, 2018, and 2017, respectively.

Amortization of deferred financing costs totaled $1.4 million, $0.4 million, and $0.5 million for the years ended December 31, 2019, 2018, and 2017, respectively.

Estimated future amortization expense for other finite lived intangible assets, including deferred financing costs, at December 31, 2019 is as follows (in thousands):



Year ending December 31,
2020	$	1,941
2021	1,935
2022	1,915
2023	1,858
2024	1,854
Thereafter	10,109
Other amortizable intangible assets, net	$	19,612

During the years ended December 31, 2019, 2018, and 2017, no impairments were recognized related to other intangible assets.