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Risk Management and Use of Derivative Financial Instruments (Details 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Amount of Gain (Loss) Recognized in Income on Derivatives    
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 1,729 $ 3,688
Interest rate swap
   
Amount of Gain (Loss) Recognized in Income on Derivatives    
Derivative Instruments, Gain (Loss) Recognized in Income, Net 1,729 3,408
Stock warrants
   
Amount of Gain (Loss) Recognized in Income on Derivatives    
Derivative Instruments, Gain (Loss) Recognized in Income, Net   $ 280