Unsecured Debt and Lines of Credit (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2013 and December 31, 2012 ($ in thousands):

							Weighted Average
	March 31,			December 31,			Maturity
	2013			2012			In Years
Bonds private placement - fixed rate	$	465,000		$	465,000			6.0
Term loan - variable rate		350,000			350,000			3.9
Bonds public offering - fixed rate		297,159			297,084			9.4
Unsecured debt		1,112,159			1,112,084
Lines of credit		102,300			141,000			2.7
Total unsecured debt and lines of credit	$	1,214,459		$	1,253,084
Weighted average interest rate on fixed rate unsecured bonds		4.2	%		4.2	%
Weighted average interest rate on variable rate term loan		2.6	%		2.7	%
Weighted average interest rate on line of credit		2.1	%		2.3	%