Quarterly report pursuant to Section 13 or 15(d)

Derivative Contracts (Details 2)

v2.4.0.8
Derivative Contracts (Details 2) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Outstanding contracts recorded at fair value and their maturity details    
Contract value $ (2,109) $ (1,304)
Fair value 2,242 1,294
Effect on income (loss) 133 (10)
0 to 30 [Member]
   
Outstanding contracts recorded at fair value and their maturity details    
Contract value (659)   
Fair value 703   
Effect on income (loss) 44 0
Contract days until maturity, lower range 0 days 0 days
Contract days until maturity, higher range 30 days 30 days
31 to 60 [Member]
   
Outstanding contracts recorded at fair value and their maturity details    
Contract value (410) (581)
Fair value 436 577
Effect on income (loss) 26 (4)
Contract days until maturity, lower range 31 days 31 days
Contract days until maturity, higher range 60 days 60 days
61 to 90 [Member]
   
Outstanding contracts recorded at fair value and their maturity details    
Contract value (618) (341)
Fair value 654 339
Effect on income (loss) 36 (2)
Contract days until maturity, lower range 61 days 61 days
Contract days until maturity, higher range 90 days 90 days
91 to 120 [Member]
   
Outstanding contracts recorded at fair value and their maturity details    
Contract value (422) (212)
Fair value 449 210
Effect on income (loss) 27 (2)
Contract days until maturity, lower range 91 days 91 days
Contract days until maturity, higher range 120 days 120 days
121 to 180 [Member]
   
Outstanding contracts recorded at fair value and their maturity details    
Contract value 0 (170)
Fair value 0 168
Effect on income (loss) 0 (2)
Contract days until maturity, lower range 121 days 121 days
Contract days until maturity, higher range 180 days 180 days
More than 180 [Member]
   
Outstanding contracts recorded at fair value and their maturity details    
Contract value 0 0
Fair value 0   
Effect on income (loss) $ 0 $ 0
Contract days until maturity, higher range 180 days 180 days