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Unsecured Debt and Lines of Credit
6 Months Ended
Jun. 30, 2013
Unsecured Debt and Lines of Credit [Abstract]  
Unsecured Debt Lines of Credit
(6) 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
%
    

In April 2013, the Company issued $300 million aggregate principal amount of its 3.25% Senior Notes due on May 1, 2023.