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Risk Management and Use of Derivative Financial Instruments (Details 8)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
USD ($)
Mar. 31, 2013
Forward contracts
USD ($)
Mar. 31, 2013
Forward contracts
EUR (€)
Mar. 31, 2013
Forward contracts
Minimum
Mar. 31, 2013
Forward contracts
Maximum
Mar. 31, 2013
Forward Contract Two
USD ($)
Mar. 31, 2013
Forward Contract Two
EUR (€)
Mar. 31, 2013
Forward Contract Two
Minimum
Mar. 31, 2013
Forward Contract Two
Maximum
Derivative Disclosure                  
Notional Amount     € 47,669       € 8,700    
Floor price   1.28 1.28     1.35 1.35    
Cap price   1.30 1.30     1.35 1.35    
Effective Date   May 01, 2012 May 01, 2012     Dec. 01, 2012 Dec. 01, 2012    
Expiration Date       Jun. 01, 2013 Jun. 01, 2017     Sep. 01, 2017 Mar. 01, 2018
Fair Value $ 262 $ (68)       $ 330