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Risk Management and Use of Derivative Financial Instruments (Details 6) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Derivative Instrument Detail  
Notional Amount $ 222,748
Fair Value 10,345
Foreign exchange forward May
 
Derivative Instrument Detail  
Notional Amount 72,916
Derivative, Floor Price 1.28
Derivative, Cap Price 1.29
Effective Date May 01, 2012
Fair Value (293)
Foreign exchange forward May | Maximum
 
Derivative Instrument Detail  
Expiration Date Jun. 01, 2017
Foreign exchange forward May | Minimum
 
Derivative Instrument Detail  
Expiration Date Dec. 01, 2014
Foreign currency collars
 
Derivative Instrument Detail  
Notional Amount 52,709
Derivative, Floor Price 1.40
Derivative, Cap Price 1.44
Effective Date Sep. 01, 2011
Fair Value 4,592
Foreign currency collars | Maximum
 
Derivative Instrument Detail  
Expiration Date Sep. 01, 2014
Foreign currency collars | Minimum
 
Derivative Instrument Detail  
Expiration Date Dec. 01, 2012
Foreign exchange forward July
 
Derivative Instrument Detail  
Notional Amount 57,870
Derivative, Floor Price 1.39
Effective Date Jul. 01, 2011
Fair Value 4,432
Foreign exchange forward July | Minimum
 
Derivative Instrument Detail  
Expiration Date Jul. 01, 2013
Foreign exchange forward September
 
Derivative Instrument Detail  
Notional Amount 39,253
Derivative, Floor Price 1.34
Derivative, Cap Price 1.35
Effective Date Sep. 01, 2011
Fair Value $ 1,614
Foreign exchange forward September | Maximum
 
Derivative Instrument Detail  
Expiration Date Mar. 01, 2015
Foreign exchange forward September | Minimum
 
Derivative Instrument Detail  
Expiration Date Mar. 01, 2013