Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Fair Value Measurement (Narrative) (Details)

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Fair Value Measurement (Narrative) (Details) - Solid Concepts Inc [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Ordinary shares issued as consideration for business acquisition 149,327 152,633 118,789
Value of ordinary shares issued as consideration for business acquisition $ 3,500 $ 3,100 $ 4,100
Cash given as consideration for business acquisition $ 500 400 900
Realized gain due to revaluation of the deferred payments in connection with acquisition   100 6,200
Unrealized gain due to revaluation of the deferred payments in connection with acquisition   $ 700 $ 17,500