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Financial Instruments (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 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     $ (398,000)    
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (766,000)   (1,522,000)    
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (557,000)   (1,031,000)    
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 Derivative at Fair Value, Net 6,500,000   6,500,000   8,172,000
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) 218,000 (1,016,000) 158,000 (1,433,000)  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 134,000 (625,000) 97,000 (881,000)  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (766,000) (757,000) (1,522,000) (1,494,000)  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net, Net of Tax (471,000) (466,000) (936,000) (919,000)  
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net (3,027,000)   (3,027,000)    
Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months Net of Tax (1,862,000)   (1,862,000)    
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness     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 Cash Flow Hedge Derivative at Fair Value, Net 916,000   916,000    
Foreign Exchange Forward [Member]
          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Notional Amount 148,816,000   148,816,000   132,323,000
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 463,000   463,000   1,097,000
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 448,000   448,000   280,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments 1,534,000 (1,592,000) (691,000) 343,000  
Foreign Exchange Forward [Member] | Designated as a Cash Flow Hedging Instrument [Member]
          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Notional Amount 74,103,000   74,103,000   77,980,000
Foreign Currency Cash Flow Hedge Asset at Fair Value 141,000   141,000    
Foreign Currency Cash Flow Hedge Liability at Fair Value 868,000   868,000   400,000
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax (549,000)   (1,337,000)    
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, After Tax (437,000)   (1,063,000)    
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (557,000)   (1,031,000)    
Foreign Currency Cash Flow Hedge Gain Loss Reclassified To Earnings, Net, After Tax (443,000)   (820,000)    
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months (727,000)   (727,000)    
Foreign Currency Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months Net of Tax (578,000)   (578,000)    
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness     $ 0