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

Trade and Other Receivables and Assets (Narrative) (Details)

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Trade and Other Receivables and Assets (Narrative) (Details)
€ in Thousands, $ in Thousands
1 Months Ended 11 Months Ended 12 Months Ended
Nov. 30, 2016
USD ($)
Nov. 30, 2016
EUR (€)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Statement Line Items [Line Items]            
Accumulated profit from forward contracts   € 4,255       € 497
Proceeds from forward contracts           € 2,647
Forward contract [Member]            
Statement Line Items [Line Items]            
Proceeds from forward contracts       € 1,100    
USD [Member]            
Statement Line Items [Line Items]            
Accumulated profit from forward contracts | $ $ 4,474       $ 597  
USD [Member] | Forward contract [Member]            
Statement Line Items [Line Items]            
Proceeds from forward contracts | $     $ 1,300