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Notes Payable Line of Credit Due 2011 (Details) (Line of Credit 2006 [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Years
banks
Line of Credit 2006 [Member]
  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 150
Line of Credit, Number of Banks in Agreement 8
Line of Credit, Length of Credit Agreement, Years 5
Line of Credit, LIBOR Basis Spread on Variable Rate 0.80%
Line of Credit, Federal Funds Rate Basis Spread on Variable Rate 0.50%