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Financial Instruments (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount $ 210,400,000 $ 210,400,000 $ 180,300,000
3.24% $100 Million Interest Rate Swap [Member] | Designated as a Cash Flow Hedging Instrument [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Line Of Credit Facility Forecasted Borrowing Amount 100,000,000 100,000,000  
Derivative, Fixed Interest Rate 3.24% 3.24%  
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 3,000,000 3,000,000  
Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months Net of Tax 1,900,000 1,900,000  
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness 0 0  
2.52% $50 Million Interest Rate Swap [Member] | Designated as a Cash Flow Hedging Instrument [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Line Of Credit Facility Forecasted Borrowing Amount 50,000,000 50,000,000  
Derivative, Fixed Interest Rate 2.52% 2.52%  
Foreign Exchange Forward [Member] | Designated as a Cash Flow Hedging Instrument [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months Net of Tax 500,000 500,000  
Derivative, Notional Amount 84,000,000 84,000,000 78,000,000
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months 600,000 600,000  
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness $ 0 $ 0