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Financial Instruments Financial Instruments Textual (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative [Line Items]        
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months   $ 1,400    
Designated as Hedging Instrument [Member] | Cross Currency Swap [Member]        
Derivative [Line Items]        
Line Of Credit Facility Forecasted Borrowing Amount $ 100,000 $ 100,000    
Derivative, Fixed Interest Rate 0.01% 0.01%    
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness $ 0 $ 0    
Designated as Hedging Instrument [Member] | 2.52% $50 Million Interest Rate Swap [Member]        
Derivative [Line Items]        
Line Of Credit Facility Forecasted Borrowing Amount $ 50,000 $ 50,000    
Derivative, Fixed Interest Rate 2.52% 2.52%    
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness $ 0 $ 0    
Designated as Hedging Instrument [Member] | 2.25% $100 Million Interest Rate Swap [Member]        
Derivative [Line Items]        
Line Of Credit Facility Forecasted Borrowing Amount $ 100,000 $ 100,000    
Derivative, Fixed Interest Rate 2.25% 2.25%    
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness $ 0 $ 0    
Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Derivative, Notional Amount 358,900 358,900   $ 353,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ (4,500) $ (6,300) $ 700