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Risk Management and Derivatives (Details 4) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivative financial instruments on consolidated statements of operations      
Gain (loss) on foreign investments $ (700,000) $ (2,300,000) $ (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) (968,000) (1,553,000)  
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings (Effective Portion) (44,000) (180,000)  
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 $ (8,920,000) $ 17,406,000 $ (1,010,000)