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Goodwill and Other Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes in the carrying amount of goodwill
  U.S. $ in thousands
   
Goodwill as of January 1, 2021 $35,694 
Goodwill acquired*   1,716  
Foreign currency translation adjustments and other  664 
Goodwill as of March 31, 2021 $38,074 

*The goodwill was acquired as part of RPS acquisition. See Note 3.

 
Schedule of other intangible assets
  March 31, 2021 December 31, 2020
   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 $365,207  $(265,352 $99,855  $357,863  $(260,123 $97,740 
Patents  17,894   (8,812  9,082   17,699   (8,487  9,212 
Trademarks and trade names  26,031   (21,397  4,634   26,036   (21,114  4,922 
Customer relationships  100,883   (82,835  18,048   101,107   (81,413  19,695 
Capitalized software development costs  7,410   (7,410  
-
   7,410   (7,410  - 
  $517,425  $(385,806 $131,619  $510,115 $(378,547$131,569 
Schedule of estimated amortization expense relating to intangible assets
  Estimated
  amortization expense
  (U.S. $ in thousands)
Remaining 9 months of 2021 $22,840 
2022  28,662 
2023  14,081 
2024  10,185 
2025 and thereafter  55,851 
Total  131,619