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Financial Instruments (Details)
$ in Thousands, € in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2015
EUR (€)
Dec. 31, 2014
EUR (€)
Derivative Instruments, Gain (Loss) [Line Items]        
Long Term Debt Percentage Bearing Fixed Interest Percentage 91.00%   91.00%  
Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
swiss franc per euro floor 1.20   1.20  
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 5,000      
Designated as Hedging Instrument [Member] | Derivative Maturing in 2015 [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional Value Local Currency | €     € 86.0  
Derivative, Average Forward Exchange Rate 1.21   1.21  
Designated as Hedging Instrument [Member] | Derivative Maturing in 2016 [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional Value Local Currency | €     € 67.0  
Derivative, Average Forward Exchange Rate 1.19   1.19  
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional Value Local Currency | €     € 66.5 € 72.0
Derivative, Notional Amount $ 72,700 $ 87,000    
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax 19,000 1,200    
Gain/Loss on FX Effectiveness 0 0    
Designated as Hedging Instrument [Member] | 3.24% $100 Million Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Line Of Credit Facility Forecasted Borrowing Amount $ 100,000      
Derivative, Fixed Interest Rate 3.24%   3.24%  
Designated as Hedging Instrument [Member] | 2.52% $50 Million Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Line Of Credit Facility Forecasted Borrowing Amount $ 50,000      
Derivative, Fixed Interest Rate 2.52%   2.52%  
Gain/Loss on IR Effectiveness $ 0 0    
Designated as Hedging Instrument [Member] | 2.25% $100 Million Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Line Of Credit Facility Forecasted Borrowing Amount $ 100,000      
Derivative, Fixed Interest Rate 2.25%   2.25%  
Not Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Notional Amount $ 318,700 325,400    
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ 5,300 $ 3,500