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Credit Arrangements Short Term Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Short-term Debt [Line Items]    
Short-term debt payable to non-affiliates $ 15,000 $ 0
Short-Term Debt December 21st [Member]    
Short-term Debt [Line Items]    
Short-term debt payable to non-affiliates $ 10,000  
Line of Credit Facility, Interest Rate During Period 0.55%  
Short-Term Debt December 30th [Member]    
Short-term Debt [Line Items]    
Short-term debt payable to non-affiliates $ 5,000  
Line of Credit Facility, Interest Rate During Period 0.46%