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Unsecured Debt and Lines of Credit (Tables)
 6 Months Ended
Jun. 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 June 30, 2013 and December 31, 2012 ($ in thousands):

 
 
June 30,
  
December 31,
  
Weighted Average
Maturity
 
 
 
2013
  
2012
  
In Years
 
 
 
  
  
 
Bonds private placement - fixed rate
 
$
465,000
  
$
465,000
   
5.7
 
Term loan - variable rate
  
350,000
   
350,000
   
3.7
 
Bonds public offering - fixed rate
  
594,744
   
297,084
   
9.5
 
Unsecured debt
  
1,409,744
   
1,112,084
     
Lines of credit
  
4,370
   
141,000
   
0.6
 
Total unsecured debt and lines of credit
 
$
1,414,114
  
$
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
  
2.6
%
  
2.7
%
    
Weighted average interest rate on line of credit
  
2.3
%
  
2.3
%