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Fair Value Measurements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Liabilities $ (458) $ (1,646)
Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Maturity of Bank Acceptances 3 months  
Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Maturity of Bank Acceptances 6 months  
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Assets $ 699 460
Derivative Liabilities (458) (1,646)
Bank acceptances 10,823 10,785
Rabbi Trust Asset Fair Value Disclosure 2,159 2,092
Fair value net asset (liability) 13,223 11,691
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Assets 0 0
Derivative Liabilities 0 0
Bank acceptances 0 0
Rabbi Trust Asset Fair Value Disclosure 2,159 2,092
Fair value net asset (liability) 2,159 2,092
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Assets 699 460
Derivative Liabilities (458) (1,646)
Bank acceptances 10,823 10,785
Rabbi Trust Asset Fair Value Disclosure 0 0
Fair value net asset (liability) 11,064 9,599
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Assets 0 0
Derivative Liabilities 0 0
Bank acceptances 0 0
Rabbi Trust Asset Fair Value Disclosure 0 0
Fair value net asset (liability) $ 0 $ 0