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Risk Management and Derivatives (Effect of derivative financial instruments on the Consolidated Statements of Operations)(Details) (Designated as Hedging Instrument, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Interest Expense | Cash flow interest rate cap
       
Derivative financial instruments on consolidated statements of operations        
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion) $ (1,590)   $ (1,590)  
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings (Effective Portion) 0   0  
Interest Expense | Cash flow interest rate swap
       
Derivative financial instruments on consolidated statements of operations        
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion) (204) 0 678 (124)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings (Effective Portion) 80 (26) 231 (265)
Other Expense | Foreign exchange contracts
       
Derivative financial instruments on consolidated statements of operations        
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion) 347   691  
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings (Effective Portion) $ 0   $ 0