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Risk Management and Derivatives (Details 1) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivative financial instruments on consolidated statements of operations    
Gain (loss) on foreign investments $ (100,000) $ (100,000)
Cash flow interest rate swap | Designated as hedge
   
Derivative financial instruments on consolidated statements of operations    
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion) 37,000 (205,000)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings (Effective Portion) 74,000 (5,000)
Foreign exchange contracts | Not designated as hedge
   
Derivative financial instruments on consolidated statements of operations    
Amount of Gain or (Loss) Recognized in Income on Derivative $ 10,156,000 $ (8,859,000)