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Debt | 3 Months Ended
--- | ---
Mar. 31, 2016
Debt Disclosure [Abstract] |
Debt | Debt The Company had the following mortgages and notes payable outstanding as of March 31, 2016 and December 31, 2015:
| March 31, 2016 |  | December 31, 2015
Mortgages and notes payable | $ | 933,430 |  |  | $ | 882,952 |
Unamortized debt issuance costs | (11,110 | ) |  | (10,309 | )
| $ | 922,320 |  |  | $ | 872,643 |
Interest rates, including imputed rates on mortgages and notes payable, ranged from 2.2% to 7.8% at March 31, 2016 and December 31, 2015 and the mortgages and notes payables mature between 2016 and 2031 as of March 31, 2016. The weighted-average interest rate was 4.9% at March 31, 2016 and December 31, 2015. The Company had the following senior notes outstanding as of March 31, 2016 and December 31, 2015:
Issue Date |  | March 31, 2016 |  |  | December 31, 2015 |  | Interest Rate |  | Maturity Date |  | Issue Price
May 2014 |  | $ | 250,000 |  |  | $ | 250,000 |  |  | 4.40 | % |  | June 2024 |  | 99.883 | %
June 2013 |  | 250,000 |  |  | 250,000 |  |  | 4.25 | % |  | June 2023 |  | 99.026 | %
|  | 500,000 |  |  | 500,000 |  |  |  |  |  |  |
Unamortized discount |  | (1,984 | ) |  | (2,053 | ) |  |  |  |  |  |
Unamortized debt issuance cost |  | (4,281 | ) |  | (4,421 | ) |  |  |  |  |  |
|  | $ | 493,735 |  |  | $ | 493,526 |  |  |  |  |  |  |
Each series of the senior notes is unsecured and requires payment of interest semi-annually in arrears. The Company may redeem the notes at its option at any time prior to maturity in whole or in part by paying the principal amount of the notes being redeemed plus a premium. The Company has a $905,000 unsecured credit agreement with KeyBank National Association, as agent. With lender approval, the Company can increase the size of the facility to an aggregate $1,810,000. A summary of the significant terms are as follows:
| Maturity Date |  | Current Interest Rate
$400,000 Revolving Credit Facility(1) | August 2019 |  | LIBOR + 1.00%
$250,000 Term Loan(2)(4) | August 2020 |  | LIBOR + 1.10%
$255,000 Term Loan(3)(4) | January 2021 |  | LIBOR + 1.10%
(1) | Maturity date can be extended to August 2020 at the Company's option. The interest rate ranges from LIBOR plus 0.85% to 1.55%. At March 31, 2016, the revolving credit facility had $147,000 outstanding and availability of $253,000, subject to covenant compliance.
(2) | The interest rate ranges from LIBOR plus 0.90% to 1.75%. The Company previously entered into aggregate interest-rate swap agreements to fix the LIBOR component at a weighted-average rate of 1.09% through February 2018 on the $250,000 of outstanding LIBOR-based borrowings.
(3) | The interest rate ranges from LIBOR plus 0.90% to 1.75%. The Company previously entered into aggregate interest-rate swap agreements to fix the LIBOR component at a weighted-average rate of 1.42% through January 2019 on the $255,000 of outstanding LIBOR-based borrowings.
(4) | The aggregate unamortized debt issuance costs for the term loans were $4,670 and $4,924 as of March 31, 2016 and December 31, 2015, respectively.
The Company was in compliance with all applicable financial covenants contained in its corporate level debt agreements at March 31, 2016. During 2010, the Company issued $115,000 aggregate principal amount of 6.00% Convertible Guaranteed Notes due 2030. The notes pay interest semi-annually in arrears and mature in January 2030. The holders of the notes may require the Company to repurchase their notes in January 2017, January 2020 and January 2025 for cash equal to 100% of the notes to be repurchased, plus any accrued and unpaid interest. The Company may not redeem any notes prior to January 2017, except to preserve its REIT status. The notes have a current conversion rate of 156.5514 common shares per one thousand principal amount of the notes, representing a conversion price of approximately $6.39 per common share. The conversion rate is subject to adjustment under certain circumstances, including increases in the Company's dividend rate above a certain threshold and the issuance of stock dividends. The notes are convertible by the holders under certain circumstances for cash, common shares or a combination of cash and common shares at the Company's election. The notes are convertible prior to the close of business on the second business day immediately preceding the stated maturity date, at any time beginning in January 2029 and also upon the occurrence of specified events. During the three months ended March 31, 2015, $600 aggregate principal amount of the notes were converted for 90,957 common shares. The conversion resulted in debt satisfaction charges of $77 for the three months ended March 31, 2015, respectively. Below is a summary of additional disclosures related to the 6.00% Convertible Guaranteed Notes due 2030.
| 6.00% Convertible Guaranteed Notes due 2030
Balance Sheets: | March 31, 2016 |  | December 31, 2015
Principal amount of debt component | $ | 12,400 |  |  | $ | 12,400 |
Unamortized discount | (167 | ) |  | (220 | )
Unamortized debt issuance costs | (41 | ) |  | (54 | )
Carrying amount of debt component | $ | 12,192 |  |  | $ | 12,126 |
Carrying amount of equity component | $ | (34,784 | ) |  | $ | (34,784 | )
Effective interest rate | 8.1 | % |  | 7.8 | %
Period through which discount is being amortized, put date | 01/2017 |  |  | 01/2017 |
Aggregate if-converted value in excess of aggregate principal amount | $ | 4,295 |  |  | $ | 2,863 |
| Three months ended March 31,
Statements of Operations: | 2016 |  | 2015
6.00% Convertible Guaranteed Notes |  |  |
Coupon interest | $ | 186 |  |  | $ | 236 |
Discount amortization | 53 |  |  | 67 |
| $ | 239 |  |  | $ | 303 |
During 2007, the Company issued $200,000 original principal amount of Trust Preferred Securities. The Trust Preferred Securities, which are classified as debt, are due in 2037, were open for redemption at the Company's option commencing April 2012 and bear interest at a fixed rate of 6.804% through April 2017 and thereafter, at a variable rate of three month LIBOR plus 170 basis points through maturity. As of March 31, 2016 and December 31, 2015, there was $129,120 original principal amount of Trust Preferred Securities outstanding and $2,099 and $2,124, respectively, of unamortized debt issuance costs. During the three months ended March 31, 2015, in connection with the satisfaction of mortgage notes other than those disclosed elsewhere in these financial statements, the Company had debt satisfaction charges, net of $14.

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