Unsecured Debt and Lines of Credit (Tables)

12 Months Ended

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

							Weighted Average
							Maturity
	2013			2012			In Years
Bonds private placement - fixed rate	$	465,000		$	465,000			5.2
Term loan - variable rate		350,000			350,000			3.2
Bonds public offering - fixed rate		595,023			297,084			9.0
Unsecured debt		1,410,023			1,112,084
Lines of credit		219,421			141,000			4.3
Total unsecured debt	$	1,629,444		$	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	%

Summary of unsecured private placement bonds

The following is a summary of the Company’s unsecured private placement bonds as of December 31, 2013 and 2012 ($ in thousands):

						Coupon
	Maturity	2013		2012		Rate
Senior unsecured private placement notes	March 2016	$	150,000	$	150,000		4.36	%
Senior unsecured private placement notes	September 2017		40,000		40,000		4.50	%
Senior unsecured private placement notes	December 2019		75,000		75,000		4.92	%
Senior unsecured private placement notes	April 2021		100,000		100,000		4.27	%
Senior unsecured private placement notes	June 2021		50,000		50,000		4.30	%
Senior unsecured private placement notes	August 2021		50,000		50,000		4.37	%
		$	465,000	$	465,000