Annual report pursuant to Section 13 and 15(d)

Derivative Contracts (Details 2)

v2.4.0.8
Derivative Contracts (Details 2) (Not Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ (36,489) $ 1,340 $ (39)
Forward Contracts [Member]
     
Derivative [Line Items]      
Contract value 1,537 1,304  
Fair value 1,585 1,294  
Derivative, Gain (Loss) on Derivative, Net 49 (10) 38
Forward Contracts [Member] | 0 to 30 [Member]
     
Derivative [Line Items]      
Contract value 472     
Fair value 489     
Derivative, Gain (Loss) on Derivative, Net 17 0  
Contract days until maturity, lower range 0 days 0 days  
Contract days until maturity, higher range 30 days 30 days  
Forward Contracts [Member] | 31 to 60 [Member]
     
Derivative [Line Items]      
Contract value 562 581  
Fair value 579 577  
Derivative, Gain (Loss) on Derivative, Net 18 (4)  
Contract days until maturity, lower range 31 days 31 days  
Contract days until maturity, higher range 60 days 60 days  
Forward Contracts [Member] | 61 to 90 [Member]
     
Derivative [Line Items]      
Contract value 503 341  
Fair value 517 339  
Derivative, Gain (Loss) on Derivative, Net 14 (2)  
Contract days until maturity, lower range 61 days 61 days  
Contract days until maturity, higher range 90 days 90 days  
Forward Contracts [Member] | 91 to 120 [Member]
     
Derivative [Line Items]      
Contract value 0 212  
Fair value 0 210  
Derivative, Gain (Loss) on Derivative, Net 0 (2)  
Contract days until maturity, lower range 91 days 91 days  
Contract days until maturity, higher range 120 days 120 days  
Forward Contracts [Member] | 121 to 180 [Member]
     
Derivative [Line Items]      
Contract value 0 170  
Fair value 0 168  
Derivative, Gain (Loss) on Derivative, Net 0 (2)  
Contract days until maturity, lower range 121 days 121 days  
Contract days until maturity, higher range 180 days 180 days  
Forward Contracts [Member] | More than 180 [Member]
     
Derivative [Line Items]      
Contract value 0 0  
Fair value 0     
Derivative, Gain (Loss) on Derivative, Net $ 0 $ 0  
Contract days until maturity, higher range 180 days 180 days