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Note 9 - Notes Payable (Details) (USD $)
3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2014
Apr. 30, 2014
Subsequent Event [Member]
Unsecured Debt [Member]
Mar. 31, 2014
London Interbank Offered Rate (LIBOR) [Member]
Mar. 31, 2014
Previous Credit Facility [Member]
Mar. 31, 2014
Including Accordion Feature [Member]
Mar. 31, 2014
Letter of Credit [Member]
Note 9 - Notes Payable (Details) [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity $ 1,750,000,000     $ 1,750,000,000 $ 2,250,000,000  
Number of Options to Extend Maturity of Credit Facility 2          
Line of Credit Facility, Length of Extension for Each Option 6 months          
Debt Instrument, Basis Spread on Variable Rate     0.925%      
Line of Credit Facility, Sub Limit 500,000,000          
Line of Credit Facility, Amount Outstanding 326,400,000         2,100,000
Debt Instrument, Face Amount   500,000,000        
Debt Instrument, Term   7 years        
Debt Instrument, Interest Rate, Stated Percentage   3.20%        
Proceeds from Issuance of Senior Long-term Debt   $ 495,400,000