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Other Intangible Assets, Net | 12 Months Ended
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Dec. 31, 2018
Other Intangible Assets [Abstract] |
Other Intangible Assets, Net | Note 8. Other Intangible Assets, Net Other intangible assets consisted of the following:
|  | December 31, 2018 |  | December 31, 2017
|  | 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 |  | $ | (236,375 | ) |  | $ | 62,725 |  | $ | 304,601 |  | $ | (220,420 | ) |  | $ | 84,181
Patents |  |  | 10,127 |  |  | (5,752 | ) |  |  | 4,375 |  |  | 19,708 |  |  | (14,279 | ) |  |  | 5,429
Trademarks and trade names |  |  | 26,212 |  |  | (19,067 | ) |  |  | 7,145 |  |  | 27,248 |  |  | (18,245 | ) |  |  | 9,003
Customer relationships |  |  | 102,984 |  |  | (70,353 | ) |  |  | 32,631 |  |  | 106,203 |  |  | (63,435 | ) |  |  | 42,768
Capitalized software development costs |  |  | 19,540 |  |  | (19,142 | ) |  |  | 398 |  |  | 19,541 |  |  | (18,800 | ) |  |  | 741
|  | $ | 457,963 |  | $ | (350,689 | ) |  | $ | 107,274 |  | $ | 477,301 |  | $ | (335,179 | ) |  | $ | 142,122
Amortization expense Amortization expense relating to intangible assets for the years ended December 31, 2018, 2017 and 2016, was approximately $32.4 million, $35.0 million and $59.0 million, respectively. The decrease in amortization expense in 2017 was primarily due to change in the estimated useful lives of certain intangibles assets, which reduced the Company's amortization expense by $20.5 million and resulted in a decrease of $18.3 million in the Company's net loss and a decrease of $0.35 in the Company's basic and diluted loss per share. The decrease in the Company's other intangible assets carrying amount, net of impairment and the corresponding accumulated amortization, as of December 31, 2018 resulted from Solidscape divestment, which is described in Note 2. As of December 31, 2018, 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)
2019 |  | $ | 29,274
2020 |  |  | 28,934
2021 |  |  | 28,775
2022 |  |  | 7,791
2023 |  |  | 8,106
Thereafter |  |  | 4,394
Total |  | $ | 107,274
During 2018, 2017 and 2016, the Company recorded impairment charges of $2.2 million, $2.2 million and $17.9 million, respectively, related to certain of its 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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