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Financial Instruments (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]      
Derivative Liability, Fair Value, Gross Liability $ 5,800,000 $ 8,900,000  
Long Term Debt Percentage Bearing Fixed Interest Percentage 73.00%    
Interest Rate Derivatives [Abstract]      
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (491,000) (1,748,000) (4,028,000)
Interest Rate Derivative Assets, at Fair Value 1,269,000 0  
Foreign Currency Cash Flow Hedges [Abstract]      
Foreign Currency Cash Flow Hedge Asset at Fair Value 268,000 0  
Foreign Currency Cash Flow Hedge Liability at Fair Value 103,000 421,000  
Designated as Hedging Instrument [Member] | 3.24% $100 Million Interest Rate Swap [Member]
      
Interest Rate Derivatives [Abstract]      
Line Of Credit Facility Forecasted Borrowing Amount 100,000,000    
Derivative, Fixed Interest Rate 3.24%    
Interest Rate Cash Flow Hedge Liability at Fair Value 5,312,000 8,172,000  
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) (200,000) (2,000,000)  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (136,000) (1,252,000)  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (3,100,000) (3,000,000)  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net, Net of Tax (1,900,000) (1,900,000)  
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net (3,000,000)    
Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months Net of Tax (1,900,000)    
Gain/Loss on IR Effectiveness 0 0  
Designated as Hedging Instrument [Member] | 2.52% $50 Million Interest Rate Swap [Member]
      
Interest Rate Derivatives [Abstract]      
Line Of Credit Facility Forecasted Borrowing Amount 50,000,000    
Derivative, Fixed Interest Rate 2.52%    
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) 1,300,000    
Interest Rate Derivative Assets, at Fair Value 1,269,000    
Foreign Currency Cash Flow Hedges [Abstract]      
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, After Tax 800,000    
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
      
Foreign Currency Cash Flow Hedges [Abstract]      
Derivative, Notional Amount 78,200,000 78,000,000  
Foreign Currency Cash Flow Hedge Asset at Fair Value 268,000    
Foreign Currency Cash Flow Hedge Liability at Fair Value 103,000 400,000  
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax (1,400,000) (600,000)  
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, After Tax (1,100,000) (500,000)  
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (2,000,000) (200,000)  
Foreign Currency Cash Flow Hedge Gain Loss Reclassified To Earnings,Net, After Tax (1,600,000) (200,000)  
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months 200,000    
Foreign Currency Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months Net of Tax 100,000    
Gain/Loss on FX Effectiveness 0 0  
Not Designated as Hedging Instrument [Member]
      
Foreign Currency Cash Flow Hedges [Abstract]      
Derivative, Notional Amount 180,300,000 132,300,000  
Derivative Instruments Not Designated as Hedging Instruments [Abstract]      
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 719,000 448,000  
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 355,000 280,000  
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ 2,110,000