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, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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