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Goodwill and Other Intangible Assets
3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets

Note 3. Goodwill and Other Intangible Assets

Goodwill

Changes in the carrying amount of the Company’s goodwill for the three months ended March 31, 2017, were as follows:

U.S. $ in millions
Goodwill as of January 1, 2017 $      385.6
Translation differences 0.2
Goodwill as of March 31, 2017 $ 385.8

Other Intangible Assets

Other intangible assets consisted of the following:

      March 31, 2017       December 31, 2016
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 $      304,766 $            (204,090 ) $      100,676 $      304,766 $           (198,632 ) $      106,134
Patents 19,485 (12,733 ) 6,752 19,009 (12,257 ) 6,752
Trademarks and trade names 27,820 (17,204 ) 10,616 27,819 (16,849 ) 10,970
Customer relationships 106,697 (56,539 ) 50,158 106,571 (54,258 ) 52,313
Capitalized software development costs 19,541 (18,441 ) 1,100 19,540 (18,251 ) 1,289
$ 478,309 $ (309,007 ) $ 169,302 $ 477,705 $ (300,247 ) $ 177,458

Amortization expense relating to intangible assets for the three-month periods ended March 31, 2017 and 2016 was approximately $8.7 million and $14.7 million, respectively. The decrease in amortization expense was primarily due to change in the estimated useful lives of certain intangibles assets.

As of March 31, 2017, estimated amortization expense relating to intangible assets currently subject to amortization for each of the following periods was as follows:

Estimated
amortization expense
(U.S. $ in thousands)
Remaining 9 months of 2017 $      26,030
2018 33,156
2019 32,226
2020 31,899
2021 31,340
Thereafter 14,651
Total $ 169,302