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Derivative Instruments (Details Textual)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2012
EUR (€)
Dec. 31, 2011
USD ($)
Derivatives Instruments (Textual) [Abstract]        
Minimum variable interest rate on Debt 0.30% 0.30%    
Maximum variable interest rate on Debt 2.75% 2.75%    
Reduced Principal amount denominated Interest rate swaps $ 88,800,000 $ 88,800,000 € 70,100,000  
Derivative Fair value Liabilities, net 300,000 300,000   600,000
Realized gains recognized in earnings in foreign currency exchange 48,000 48,000    
Unrealized losses recognized in earnings from cross currency swaps $ (10,300,000) $ (10,300,000)