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Financial Instruments (Details) (USD $)
 2 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Financial Instruments (Textuals) [Abstract]            
Line Of Credit Facility Forecasted Borrowing Amount $ 100,000,000 $ 100,000,000   $ 100,000,000    
Derivative, Fixed Interest Rate 3.24% 3.24%   3.24%    
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net 8,950,000 8,950,000   8,950,000   9,175,000
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net   (757,000) (800,000) (2,251,000) (2,300,000)  
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)   164,000 (2,700,000) 225,000 (3,600,000)  
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net (3,062,000) (3,062,000)   (3,062,000)    
Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months Net of Tax (1,944,000) (1,944,000)   (1,944,000)    
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives 76,596,000 76,596,000   76,596,000    
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net 600,000 600,000   600,000    
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (48,000)          
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax (600,000)          
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months (600,000) (600,000)   (600,000)    
Foreign Currency Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months Net of Tax (477,000) (477,000)   (477,000)    
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value 357,000 357,000   357,000   545,000
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value 501,000 501,000   501,000   480,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments   1,397,000 (3,200,000) 1,740,000 1,200,000  
Notional Value of Other Derivatives $ 154,537,000 $ 154,537,000   $ 154,537,000   $ 143,600,000