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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Quoted Prices in Active Markets for Identical Assets (Level 1)
Dec. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Jun. 30, 2014
Significant Other Observable Inputs (Level 2)
Dec. 31, 2013
Significant Other Observable Inputs (Level 2)
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Dec. 31, 2013
Significant Unobservable Inputs (Level 3)
Jun. 30, 2014
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2013
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2014
Minimum [Member]
Jun. 30, 2014
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Asset derivatives $ 51 $ 543 $ 0 $ 0 $ 51 $ 543 $ 0 $ 0 $ 51 $ 543    
Liability derivatives (2,020) (755) 0 0 (2,020) (755) 0 0 (2,020) (755)    
Bank acceptances     0 0 5,859 6,461 0 0 5,859 6,461    
Rabbi trust assets     2,123 1,975 0 0 0 0 2,113 1,975    
Financial assets and financial liabilities, reported at fair value     $ 2,123 $ 1,975 $ 3,890 $ 6,249 $ 0 $ 0 $ 6,003 $ 8,224    
Maturity of bank acceptances                     3 months 6 months