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Fair Value Measurements (Details) - Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Assets:    
Derivative contracts $ 344 $ 327
Liabilities:    
Derivative contracts 1,339 1,979
Level 1 [Member]    
Assets:    
Derivative contracts [1] 338 5
Liabilities:    
Derivative contracts [1] 1,339 1,569
Level 2 [Member]    
Assets:    
Derivative contracts [2] 6 322
Liabilities:    
Derivative contracts [2] 410
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