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Trademarks, Licenses and Other Intangible Assets (Details Textual)
$ in Thousands, € in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
EUR (€)
Licensing Agreements Line Terms [Line Items]        
Amortization expense $ 5,900 $ 5,800 $ 6,600  
Future amortization expense:        
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 5,700      
Finite-Lived Intangible Assets, Amortization Expense, Year Two 5,700      
Finite-Lived Intangible Assets, Amortization Expense, Year Three 4,600      
Finite-Lived Intangible Assets, Amortization Expense, Year Four 4,600      
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 4,600      
Amortization period 14 years      
Weighted average cost of capital 6.20%      
Repurchase price $ 74,000     € 70
Impairment of Intangible Assets, Finite-lived $ 5,658 0 0  
Maximum [Member]        
Future amortization expense:        
Amortization period 20 years      
Minimum [Member]        
Future amortization expense:        
Amortization period 3 years      
Trademarks [Member]        
Future amortization expense:        
Amortization period 18 years      
Impairment of Intangible Assets, Finite-lived $ 0 $ 0 $ 0  
Licenses [Member]        
Future amortization expense:        
Amortization period 14 years      
Impairment of Intangible Assets, Finite-lived $ 5,700      
Other Intangible Assets [Member]        
Future amortization expense:        
Amortization period 2 years