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Fair Value Measurements (Details) - Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Assets:    
Derivative contracts $ 1,681 $ 2,377
Liabilities:    
Derivative contracts 2,192 4,003
Level 1 (1) [Member]    
Assets:    
Derivative contracts [1] 373 1,001
Liabilities:    
Derivative contracts [1] 609 440
Level 2 (2) [Member]    
Assets:    
Derivative contracts [2] 1,308 1,376
Liabilities:    
Derivative contracts [2] $ 1,583 $ 3,563
Level 3 (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