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Risk Management and Use of Derivative Financial Instruments (Details 8)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
USD ($)
Jun. 30, 2013
Forward contracts
USD ($)
Jun. 30, 2013
Forward contracts
EUR (€)
Jun. 30, 2013
Forward contracts
Minimum
Jun. 30, 2013
Forward contracts
Maximum
Jun. 30, 2013
Forward contract two
USD ($)
Jun. 30, 2013
Forward contract two
EUR (€)
Jun. 30, 2013
Forward contract two
Minimum
Jun. 30, 2013
Forward contract two
Maximum
Jun. 30, 2013
Forward contract three
USD ($)
Jun. 30, 2013
Forward contract three
EUR (€)
Jun. 30, 2013
Forward contract three
Minimum
Jun. 30, 2013
Forward contract three
Maximum
Derivative Disclosure                          
Notional Amount     € 45,114       € 8,700       € 30,717    
Floor price   1.28 1.28     1.35 1.35     1.3 1.3    
Cap price   1.30 1.30     1.35 1.35     1.35 1.35    
Effective Date   May 01, 2012 May 01, 2012     Dec. 01, 2012 Dec. 01, 2012     Jun. 01, 2013 Jun. 01, 2013    
Expiration Date       Sep. 01, 2013 Jun. 01, 2017     Sep. 01, 2017 Mar. 01, 2018     Sep. 01, 2013 Sep. 01, 2018
Fair Value $ (788) $ (910)       $ 76       $ 46