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Fair Value Measurements (Schedule of Fair Value Measurements) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Long term investment $ 1,634 $ 1,634
Derivative liabilities, net (28,480) 2,687
Level 2 [Member]
   
Long term investment 1,634 1,634
Derivative liabilities, net 545 2,687
Level 3 [Member]
   
Long term investment      
Derivative liabilities, net (29,025)   
Foreign Exchange Future [Member]
   
Derivative assets, net 301 1,818
Derivative liabilities, net (1,543) (765)
Foreign Exchange Future [Member] | Level 2 [Member]
   
Derivative assets, net 301 1,818
Derivative liabilities, net (1,543) (765)
Foreign Exchange Future [Member] | Level 3 [Member]
   
Derivative assets, net      
Derivative liabilities, net      
Foreign Exchange Future Two [Member]
   
Derivative assets, net 153  
Foreign Exchange Future Two [Member] | Level 2 [Member]
   
Derivative assets, net 153  
Foreign Exchange Future Two [Member] | Level 3 [Member]
   
Derivative assets, net     
Earn Out Obligations [Member]
   
Derivative liabilities, net (29,025)  
Earn Out Obligations [Member] | Level 2 [Member]
   
Derivative liabilities, net     
Earn Out Obligations [Member] | Level 3 [Member]
   
Derivative liabilities, net $ (29,025)