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Investment In Partnerships (Narrative) (Details) - EUR (€)
€ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2018
Dec. 31, 2018
Dec. 31, 2017
Soundperience GmbH [Member]      
Schedule of Equity Method Investments [Line Items]      
Additional percentage acquired 33.00%    
Percentage ownership after transaction   49.00%  
Cost method, ownership interest     16.00%
Purchase price € 1,500    
Signison [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method, ownership interest   50.00%