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Other Intangible Assets, Net | 12 Months Ended
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Dec. 31, 2019
Other Intangible Assets [Abstract] |
Other Intangible Assets, Net | Note 8. Other Intangible Assets, Net Other intangible assets consisted of the following:
|  | December 31, 2019 |  |  | December 31, 2018
|  | Carrying Amount, |  |  |  | Net |  | Carrying Amount, |  |  |  | Net
|  | Net of |  | Accumulated |  | Book |  | Net of |  | Accumulated |  | Book
|  | Impairment |  | Amortization |  | Value |  | Impairment |  | Amortization |  | Value
|  | U.S. $ in thousands
Developed technology |  | $ | 299,100 |  |  | $ | (252,136 | ) |  | $ | 46,964 |  |  | $ | 299,100 |  |  | $ | (236,375 | ) |  | $ | 62,725 |
Patents |  |  | 15,142 |  |  |  | (7,067 | ) |  |  | 8,075 |  |  |  | 10,127 |  |  |  | (5,752 | ) |  |  | 4,375 |
Trademarks and trade names |  |  | 25,991 |  |  |  | (19,966 | ) |  |  | 6,025 |  |  |  | 26,212 |  |  |  | (19,067 | ) |  |  | 7,145 |
Customer relationships |  |  | 102,936 |  |  |  | (76,813 | ) |  |  | 26,123 |  |  |  | 102,984 |  |  |  | (70,353 | ) |  |  | 32,631 |
Capitalized software development costs |  |  | 18,630 |  |  |  | (18,489 | ) |  |  | 141 |  |  |  | 19,540 |  |  |  | (19,142 | ) |  |  | 398 |
|  | $ | 461,799 |  |  | $ | (374,471 | ) |  | $ | 87,328 |  |  | $ | 457,963 |  |  | $ | (350,689 | ) |  | $ | 107,274 |
Amortization expense Amortization expense relating to intangible assets for the years ended December 31, 2019, 2018 and 2017, was approximately $25.2 million, $32.4 million and $35.0 million, respectively. The decrease in amortization expense in 2019 was primarily due to change in the estimated useful lives of certain intangibles assets as of December 31, 2018. As of December 31, 2019, estimated future amortization expense relating to definite life intangible assets for each of the next five years and thereafter were as follows:
|  | Estimated amortization
|  | expense
Year ending December 31, |  | (U.S. $ in thousands)
2020 |  | $ | 24,792
2021 |  |  | 24,667
2022 |  |  | 24,598
2023 |  |  | 7,662
2024 |  |  | 3,605
Thereafter |  |  | 2,004
Total |  | $ | 87,328
During the years ended December 31, 2018 and 2017, the Company recorded impairment charges of $2.2 million in each of the two years, related to its definite life intangible assets. No impairment charges were recorded during 2019.

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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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