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Nature of Operations and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of estimated useful lives

Depreciation is computed primarily over the following periods:

Useful Life
in Years
Buildings 25 - 40
Machinery and equipment 5 - 10
Buildings improvements 5 - 10
Computer equipment and software 3 - 5
Office equipment, furniture and fixtures 5 - 14
Schedule of useful lives of intangible assets

Intangible assets and their useful lives are as follows:

Weighted Average
Useful Life (in Years)
Developed technology 6
Patents 10
Trade names 9
Customer relationships 7
Schedule of changes in deferred revenues relating to warranty commitments

The Company's deferred revenues as of December 31, 2018 and 2017 were as follows:

      December 31,       December 31,
2018 2017
U.S. $ in thousands
Deferred revenue* 72,387 68,108

*Includes $18.4 million and $15.2 million under long term deferred revenue in the Company's consolidated balance sheets as of December 31, 2018 and December 31, 2017, respectively.