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Note 12 - Notes Payable (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2015
Mar. 31, 2015
Jan. 31, 2015
Apr. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Note 12 - Notes Payable (Details) [Line Items]            
Debt Covenants, Dividend Payment Restriction, Maximum Payment         $ 26,000,000  
Line of Credit Facility, Sub Limit         500,000,000  
Long-term Line of Credit         0  
Adjustments for New Accounting Principle, Early Adoption [Member] | Notes Payable [Member]            
Note 12 - Notes Payable (Details) [Line Items]            
Unamortized Fair Value Adjustments During Period         $ 31,400,000  
London Interbank Offered Rate (LIBOR) [Member]            
Note 12 - Notes Payable (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate         0.925%  
Term Loan [Member]            
Note 12 - Notes Payable (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate     1.05%      
Debt Instrument, Interest Rate, Effective Percentage         1.37% 1.21%
Unsecured Debt     $ 650,000,000      
Repayments of Long-term Debt     $ 400,000,000      
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Note 12 - Notes Payable (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate     0.95%   0.95% 1.05%
Term Loan [Member] | Base Rate [Member]            
Note 12 - Notes Payable (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate     1.37%      
Line of Credit [Member]            
Note 12 - Notes Payable (Details) [Line Items]            
Debt Instrument, Interest Rate, Effective Percentage         1.35% 1.09%
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Note 12 - Notes Payable (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate         0.925% 0.925%
Unsecured Debt [Member]            
Note 12 - Notes Payable (Details) [Line Items]            
Debt, Weighted Average Interest Rate         3.88%  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months         $ 300,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Two         940,900,000  
Long-term Debt, Maturities, Repayments of Principal in Year Three         407,900,000  
Long-term Debt, Maturities, Repayments of Principal in Year Four         300,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Five         143,900,000  
Long-term Debt, Maturities, Repayments of Principal after Year Five         1,700,000,000  
Debt Instrument, Face Amount $ 500,000,000 $ 350,000,000   $ 500,000,000    
Debt Instrument, Term 7 years 30 years   7 years    
Debt Instrument, Interest Rate, Stated Percentage 3.40% 4.25%   3.20%    
Proceeds from Issuance of Senior Long-term Debt $ 493,000,000 $ 342,700,000   $ 495,400,000    
Revolving Credit Facility [Member]            
Note 12 - Notes Payable (Details) [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity         $ 1,750,000,000  
Line of Credit Facility, Interest Rate at Period End         1.35%  
Including Accordion Feature [Member]            
Note 12 - Notes Payable (Details) [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity         $ 2,250,000,000  
Letter of Credit [Member]            
Note 12 - Notes Payable (Details) [Line Items]            
Long-term Line of Credit         $ 900,000