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Debt (Tables) | 3 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Schedule of debt and lines of credit | 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 |

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- Definition Tabular disclosure of information pertaining to long-debt instruments, line of credit or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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