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Trademarks, Licenses and Other Intangible Assets (Details Textual)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
EUR (€)
Licensing Agreements Line Terms [Line Items]        
Amortization expense $ 5.8 $ 6.6 $ 6.2  
Future amortization expense:        
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 6.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Two 6.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Three 4.9      
Finite-Lived Intangible Assets, Amortization Expense, Year Four 4.9      
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 4.9      
Amortization period 14 years      
Weighted average cost of capital 8.02%      
Repurchase price $ 76.0     € 70
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      
Licenses [Member]        
Future amortization expense:        
Amortization period 14 years      
Other Intangible Assets [Member]        
Future amortization expense:        
Amortization period 2 years