Quarterly report pursuant to Section 13 or 15(d)

Derivative Contracts - Outstanding Forward Contracts (Details)

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Derivative Contracts - Outstanding Forward Contracts (Details) - Not Designated as Hedging Instrument - Forward contracts - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Derivative [Line Items]    
Contract value $ 4,951 $ 908
Fair value 5,016 944
Effect on income (loss) 65 36
0 to 30    
Derivative [Line Items]    
Contract value 2,790 750
Fair value 2,840 780
Effect on income (loss) $ 50 $ 30
Contract days until maturity, lower range 0 days 0 days
Contract days until maturity, higher range 30 days 30 days
31 to 60    
Derivative [Line Items]    
Contract value $ 1,966 $ 90
Fair value 1,979 93
Effect on income (loss) $ 13 $ 3
Contract days until maturity, lower range 31 days 31 days
Contract days until maturity, higher range 60 days 60 days
61 to 90    
Derivative [Line Items]    
Contract value $ 195 $ 0
Fair value 197 0
Effect on income (loss) $ 2 $ 0
Contract days until maturity, lower range 61 days 61 days
Contract days until maturity, higher range 90 days 90 days
91 to 120    
Derivative [Line Items]    
Contract value $ 0 $ 68
Fair value 0 71
Effect on income (loss) $ 0 $ 3
Contract days until maturity, lower range 91 days 91 days
Contract days until maturity, higher range 120 days 120 days
121 to 180    
Derivative [Line Items]    
Contract value   $ 0
Fair value   0
Effect on income (loss)   $ 0
Contract days until maturity, lower range   121 days
Contract days until maturity, higher range   180 days
More than 120    
Derivative [Line Items]    
Contract value $ 0  
Fair value 0  
Effect on income (loss) $ 0  
Contract days until maturity, higher range 120 days  
More than 180    
Derivative [Line Items]    
Contract value   $ 0
Fair value   0
Effect on income (loss)   $ 0
Contract days until maturity, higher range   180 days