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Fair Value Measurements (Details) - Recurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets:    
Derivative contracts $ 2,485 $ 4,358
Liabilities:    
Derivative contracts 701 1,228
Level 1 [Member]    
Assets:    
Derivative contracts [1] 1,701 3,091
Liabilities:    
Derivative contracts [1] 589 693
Level 2 [Member]    
Assets:    
Derivative contracts [2] 784 1,267
Liabilities:    
Derivative contracts [2] 112 535
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