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Debt (Tables) | 6 Months Ended
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Jun. 30, 2016
Debt Disclosure [Abstract] |
Schedule of debt and lines of credit | Debt consists of the following ($ in thousands):
| June 30, 2016 |  | December 31, 2015 |  | Weighted Average Maturity In Years
Unsecured bonds private placement - fixed rate | $ | 314,067 |  |  | $ | 463,891 |  |  | 4.1
Term loan - variable rate | 224,635 |  |  | 224,467 |  |  | 0.4
Bonds public offering - fixed rate | 2,839,026 |  |  | 2,400,322 |  |  | 6.8
Unsecured debt, net (1) | 3,377,728 |  |  | 3,088,680 |  |  |
Lines of credit, net (2) | — |  |  | 11,707 |  |  |
Mortgage notes payable, net (3) | 2,240,558 |  |  | 2,215,077 |  |  | 5.3
Total debt, net | $ | 5,618,286 |  |  | $ | 5,315,464 |  |  |
Weighted average interest rate on fixed rate unsecured and unsecured private placement bonds | 3.6 | % |  | 3.6 | % |  |
Weighted average interest rate on variable rate term loan | 2.4 | % |  | 2.4 | % |  |
Weighted average interest rate on lines of credit | 1.9 | % |  | 1.9 | % |  |
Weighted average interest rate on mortgage notes payable | 4.4 | % |  | 4.4 | % |  |
(1) Includes unamortized premium and discounts of $5.7 million and $14.3 million and reduced by unamortized debt issuance costs of $18.0 million and $15.6 million, as of June 30, 2016 and December 31, 2015, respectively. (2) Lines of credit, net, related to the Company's two lines of unsecured credit aggregating $1.0 billion, excludes unamortized debt issuance costs of $3.8 million as of June 30, 2016 as the net effect resulted in a negative debt balance and as such the amount was reclassified to prepaid expenses and other assets on the condensed consolidated balance sheets. The December 31, 2015 amount includes $3.3 million of unamortized debt issuance costs because the net balance resulted in a positive debt balance and is presented on a net basis. (3) Includes unamortized premium of $59.9 million and $64.8 million and reduced by unamortized debt issuance costs of $7.6 million and $8.0 million, as of June 30, 2016 and December 31, 2015, respectively.
Summary of aggregate scheduled principal payments | The aggregate scheduled principal payments of the Company’s outstanding debt as of June 30, 2016 are as follows (excluding lines of credit) (in thousands):
Remaining in 2016 | $ | 215,402 |
2017 | 564,851 |
2018 | 321,328 |
2019 | 661,954 |
2020 | 693,868 |
Thereafter | 3,120,852 |
| $ | 5,578,255 |

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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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