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Notes Payable (Line of Credit Narrative) (Details) (Line of Credit 2011 [Member], USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
banks
Dec. 31, 2013
Line of Credit 2011 [Member]
    
Line of Credit Facility [Line Items]    
Repayment of line of credit $ 15  
Line of credit, duration   3 years
Line of credit, maximum borrowing capacity 160  
Line of credit, number of banks in agreement 7  
Line of credit, interest rate, floating, applicable margin 2.00%  
Line of credit, interest rate, floating, adjusted LIBOR 3.00%  
Line of credit, unused capacity, commitment fee percentage 0.50%  
Line of credit, amount outstanding $ 0