Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt consists of the following ($ in thousands):



	March 31, 2018			December 31, 2017			Weighted Average Maturity In Years as of March 31, 2018
Unsecured bonds private placement - fixed rate	$	274,476		$	274,427		2.8
Term loan - variable rate	348,525			348,545			3.9
Bonds public offering - fixed rate	3,174,922			2,878,737			8.4
Unsecured debt, net ⁽¹⁾	3,797,923			3,501,709
Lines of credit ⁽²⁾	—			179,000
Mortgage notes payable, net ⁽³⁾	1,921,047			2,008,417			5.3
Total debt, net	$	5,718,970		$	5,689,126
Weighted average interest rate on fixed rate unsecured bonds private placement and bonds public offering	3.8		%	3.7		%
Weighted average interest rate on variable rate term loan	2.5		%	2.5		%
Weighted average interest rate on lines of credit	2.5		%	2.3		%
Weighted average interest rate on mortgage notes payable	4.2		%	4.2		%

(1) Includes unamortized discount of $6.6 million and $5.2 million and unamortized debt issuance costs of $20.5 million and $18.1 million, as of March 31, 2018 and December 31, 2017, respectively.

(2) Lines of credit, related to the Company's two lines of unsecured credit aggregating $1.24 billion as of March 31, 2018, excludes unamortized debt issuance costs of $4.9 million and $3.2 million as of March 31, 2018 and December 31, 2017, respectively. These debt issuance costs are included in prepaid expenses and other assets on the condensed consolidated balance sheets. As of March 31, 2018, the Company’s $1.2 billion credit facility had an interest rate of LIBOR plus 0.875%, which is based on a tiered rate structure tied to the Company’s credit ratings and a scheduled maturity date of December 2021 with one 18-month extension, exercisable at the Company’s option. As of March 31, 2018, the Company’s $35.0 million working capital unsecured line of credit had an interest rate of LIBOR plus 0.875%, which is based on a tiered rate structure tied to the Company’s credit ratings and a scheduled maturity date of January 2020.

(3) Includes total unamortized premium of $29.2 million and $33.2 million, reduced by unamortized debt issuance costs of $4.9 million and $5.4 million, as of March 31, 2018 and December 31, 2017, respectively.

Summary of aggregate scheduled principal payments

The aggregate scheduled principal payments of the Company’s outstanding debt as of March 31, 2018 are as follows (excluding lines of credit) ($ in thousands):



Remaining in 2018	$	126,740
2019	627,016
2020	694,921
2021	544,846
2022	692,466
Thereafter	3,035,808
Total	$	5,721,797