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Other Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Other Intangible Assets | Other Intangible Assets 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.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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