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Short-term Debt and Credit Lines (Total Short-term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Short-term Debt    
Total short-term debt $ 70,045 $ 66,730
Notes payable to banks
    
Short-term Debt    
Total short-term debt 4,795 3,300
Commercial paper
    
Short-term Debt    
Total short-term debt $ 65,250 $ 63,430