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Short-term Debt and Credit Lines (Total Short-term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Short-term Debt    
Total short-term debt $ 66,730 $ 1,790
Notes payable to banks
    
Short-term Debt    
Total short-term debt 3,300 1,790
Commercial paper
    
Short-term Debt    
Total short-term debt $ 63,430 $ 0