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Fair Value Measurements (Details) - Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Assets:    
Derivative contracts $ 4,842 $ 2,651
Liabilities:    
Derivative contracts 2,546 1,727
Level 1 ([Member]    
Assets:    
Derivative contracts [1] 389 256
Liabilities:    
Derivative contracts [1] 161 60
Level 2 [Member]    
Assets:    
Derivative contracts [2] 4,453 2,395
Liabilities:    
Derivative contracts [2] 2,385 1,667
Level 3 [Member]    
Assets:    
Derivative contracts [3]
Liabilities:    
Derivative contracts [3]
[1] quoted prices in active markets for identical assets or liabilities
[2] observable inputs other than quoted prices in active markets for identical assets and liabilities
[3] no observable pricing inputs in the market