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Financial Instruments (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]          
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax     $ (924,000)    
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 Derivative Liabilities, at Fair Value 6,000,000   6,000,000   8,200,000
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) (300,000) (600,000) (100,000) (2,000,000)  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (200,000) (400,000) (100,000) (1,200,000)  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (777,000) (800,000) (2,299,000) (2,300,000)  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net, Net of Tax (500,000) (500,000) (1,400,000) (1,400,000)  
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%    
Interest Rate Derivative Assets, at Fair Value 700,000   700,000    
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) (200,000)   700,000    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (100,000)   400,000    
Foreign Exchange Forward [Member] | Designated as a Cash Flow Hedging Instrument [Member]
          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Notional Amount 76,700,000   76,700,000   78,000,000
Foreign Currency Cash Flow Hedge Asset at Fair Value 100,000   100,000    
Foreign Currency Cash Flow Hedge Liability at Fair Value 600,000   600,000   400,000
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax (200,000)   (1,600,000) (600,000)  
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, After Tax (200,000)   (1,300,000) (500,000)  
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (486,000) 0 (1,517,000)    
Foreign Currency Cash Flow Hedge Gain Loss Reclassified To Earnings, Net, After Tax (400,000) 0 (1,200,000)    
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months (500,000)   (500,000)    
Foreign Currency Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months Net of Tax (400,000)   (400,000)    
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness 0   0    
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Notional Amount 146,900,000   146,900,000   132,300,000
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 900,000   900,000   500,000
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 400,000   400,000   300,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ 1,400,000 $ 1,400,000 $ 700,000 $ 1,700,000