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Unsecured Debt and Lines of Credit (Tables)
 9 Months Ended
Sep. 30, 2013
Unsecured Debt and Lines of Credit [Abstract]  
Schedule of unsecured debt and lines of credit
Unsecured debt and lines of credit consist of the following as of September 30, 2013 and December 31, 2012 ($ in thousands):

 
 
 
September 30,
2013
  
 
December 31,
2012
  
Weighted Average
Maturity
In Years
 
 
         
Bonds private placement - fixed rate
 
$
465,000
  
$
465,000
   
5.5
 
Term loan - variable rate
  
350,000
   
350,000
   
3.4
 
Bonds public offering - fixed rate
  
594,883
   
297,084
   
9.2
 
Unsecured debt
  
1,409,883
   
1,112,084
     
Lines of credit
  
15,352
   
141,000
   
0.3
 
Total unsecured debt and lines of credit
 
$
1,425,235
  
$
1,253,084
     
 
            
Weighted average interest rate on fixed rate unsecured bonds
  
4.0
%
  
4.2
%
    
Weighted average interest rate on variable rate term loan
  
2.5
%
  
2.7
%
    
Weighted average interest rate on line of credit
  
2.2
%
  
2.3
%