Other Intangible Assets

Other intangible assets are as follows (in thousands):



	December 31,
	2017				2016
	Cost		Accumulated Amortization		Cost		Accumulated Amortization
Finite lived intangible assets:
Patents and technology	$	17,310	$	5,586	$	16,815	$	4,537
Customer lists	30,877		8,127		30,877		6,518
Trademarks and brand names	1,549		1,117		1,467		1,069
Total finite lived intangible assets acquired	49,736		14,830		49,159		12,124
Deferred financing costs	1,791		96		1,804		117
Total amortizable intangible assets	51,527		$	14,926	50,963		$	12,241
Indefinite lived intangible assets:
Trademarks and brand names	11,630				11,630
Total other intangible assets	$	63,157			$	62,593

Carrying amount:
Other intangible assets, net	$	48,231			$	50,352

Intangible assets acquired are amortized on a straight-line basis over two to 20 years. Amortization of intangible assets acquired totaled $2.7 million, $2.8 million, and $3.0 million for the years end ended December 31, 2017, 2016, and 2015, respectively.

Amortization of deferred financing costs totaled $0.5 million, $0.4 million, and $0.3 million for the years ended December 31, 2017, 2016, and 2015, respectively.

Estimated future amortization expense for other finite lived intangible assets, including deferred financing costs, at December 31, 2017 is as follows (in thousands):



Year ending December 31,
2018	$	3,017
2019	2,956
2020	2,929
2021	2,916
2022	2,664
Thereafter	22,119
Other amortizable intangible assets, net	$	36,601

During the years ended December 31, 2017, 2016, and 2015, no impairments were recognized related to other intangible assets.