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Fair Value Measurements (Details) (Recurring [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Assets:    
Derivative contracts $ 857 $ 1,682
Liabilities:    
Derivative contracts 391 385
Level 1 [Member]
    
Assets:    
Derivative contracts 254 [1] 390 [1]
Liabilities:    
Derivative contracts 12 [1] 13 [1]
Level 2 [Member]
    
Assets:    
Derivative contracts 603 [2] 1,230 [2]
Liabilities:    
Derivative contracts 379 [2] 372 [2]
Level 3 [Member]
    
Assets:    
Derivative contracts    [3] 62 [3]
Liabilities:    
Derivative contracts    [3]    [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