Unsecured Debt and Lines of Credit (Tables)

3 Months Ended

Mar. 31, 2014

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, 2014 and December 31, 2013 ($ in thousands):

							Weighted Average
	March 31,			December 31,			Maturity
	2014			2013			In Years
Bonds private placement - fixed rate	$	465,000		$	465,000			5.0
Term loan - variable rate		350,000			350,000			2.9
Bonds public offering - fixed rate		595,162			595,023			8.7
Unsecured debt		1,410,162			1,410,023
Lines of credit		135,903			219,421			5.0
Total unsecured debt and lines of credit	$	1,546,065		$	1,629,444
Weighted average interest rate on fixed rate unsecured bonds		4.0	%		4.0	%
Weighted average interest rate on variable rate term loan		2.4	%		2.5	%
Weighted average interest rate on line of credit		1.6	%		2.2	%