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Indebtedness (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule of additional outstanding debt | At December 31, 2018 and 2017, our outstanding senior unsecured notes and secured debt consisted of the following:
|  |  |  |  |  | December 31, 2018 |  | December 31, 2017
Senior Unsecured Notes |  | Coupon |  | Maturity |  | Face Amount |  | Unamortized Discount |  | Face Amount |  | Unamortized Discount
Senior unsecured notes |  | 3.250 | % |  | May 19 |  | $ | 400,000 |  |  | $ | 19 |  |  | $ | 400,000 |  |  | $ | 78 |
Senior unsecured notes |  | 6.750 | % |  | Apr 20 |  | 200,000 |  |  | 274 |  |  | 200,000 |  |  | 488 |
Senior unsecured notes |  | 6.750 | % |  | Dec 21 |  | 300,000 |  |  | 1,558 |  |  | 300,000 |  |  | 2,093 |
Senior unsecured notes |  | 4.750 | % |  | May 24 |  | 250,000 |  |  | 421 |  |  | 250,000 |  |  | 500 |
Senior unsecured notes |  | 4.750 | % |  | Feb 28 |  | 500,000 |  |  | 7,702 |  |  | — |  |  | — |
Senior unsecured notes |  | 5.625 | % |  | Aug 42 |  | 350,000 |  |  | — |  |  | 350,000 |  |  | — |
Senior unsecured notes |  | 6.250 | % |  | Feb 46 |  | 250,000 |  |  | — |  |  | 250,000 |  |  | — |
Total senior unsecured notes |  |  |  |  |  | $ | 2,250,000 |  |  | $ | 9,974 |  |  | $ | 1,750,000 |  |  | $ | 3,159 |
Schedule of secured and other debt |
|  | Principal Balance as of December 31, |  |  |  |  |  | Number of Properties as Collateral |  | Net Book Value of Collateral as of December 31,
Secured and Other Debt |  | 2018(1) |  | 2017(1) |  | Interest Rate |  | Maturity |  | At December 31, 2018 |  | 2018 |  | 2017
Mortgage notes (2) |  | $ | — |  |  | $ | 12,552 |  |  | 6.31 | % |  | Oct 18 |  | — |  |  | $ | — |  |  | $ | 16,470 |
Mortgage notes (2) |  | — |  |  | 11,858 |  |  | 6.24 | % |  | Oct 18 |  | — |  |  | — |  |  | 15,025 |
Mortgage note (2) |  | — |  |  | 67,749 |  |  | 4.47 | % |  | Oct 18 |  | — |  |  | — |  |  | 175,975 |
Mortgage note (2) |  | — |  |  | 6,430 |  |  | 4.69 | % |  | Jan 19 |  | — |  |  | — |  |  | 9,477 |
Mortgage note |  | 42,618 |  |  | 43,558 |  |  | 3.79 | % |  | Jul 19 |  | 4 |  |  | 61,199 |  |  | 62,596 |
Mortgage note |  | 2,037 |  |  | 2,603 |  |  | 7.49 | % |  | Jan 22 |  | 1 |  |  | 14,602 |  |  | 15,099 |
Mortgage note |  | 13,146 |  |  | 13,741 |  |  | 6.28 | % |  | Jul 22 |  | 1 |  |  | 24,064 |  |  | 24,414 |
Mortgage note |  | 11,180 |  |  | 11,392 |  |  | 4.85 | % |  | Oct 22 |  | 1 |  |  | 20,602 |  |  | 21,065 |
Mortgage note |  | 16,441 |  |  | — |  |  | 5.75 | % |  | Oct 22 |  | 2 |  |  | 20,342 |  |  | — |
Mortgage note |  | 16,442 |  |  | — |  |  | 6.64 | % |  | Jun 23 |  | 1 |  |  | 20,538 |  |  | — |
Mortgage notes (3) |  | 620,000 |  |  | 620,000 |  |  | 3.53 | % |  | Aug 26 |  | 1 |  |  | 745,079 |  |  | 764,622 |
Mortgage note |  | 1,983 |  |  | 2,395 |  |  | 6.25 | % |  | Feb 33 |  | 1 |  |  | 4,402 |  |  | 4,473 |
Mortgage note |  | 10,901 |  |  | — |  |  | 4.44 | % |  | Jul 43 |  | 1 |  |  | 13,816 |  |  | — |
Mortgage note (2) |  | — |  |  | 4,338 |  |  | 4.38 | % |  | Sep 43 |  | — |  |  | — |  |  | 7,290 |
Capital Leases |  | 9,832 |  |  | 10,694 |  |  | 7.70 | % |  | Apr 26 |  | 2 |  |  | 17,970 |  |  | 18,525 |
Total secured |  | $ | 744,580 |  |  | $ | 807,310 |  |  |  |  |  |  | 15 |  |  | $ | 942,614 |  |  | $ | 1,135,031 |
(1) | The principal balances are the amounts stated in the contracts. In accordance with GAAP, our carrying values and recorded interest expense may be different because of market conditions at the time we assumed certain of these debts. As of December 31, 2018 and 2017, the unamortized net premiums and debt issuance costs on certain of these mortgages were $394 and $1,906, respectively.
(2) | In 2018, we prepaid these debts.
(3) | In July 2016, we entered loan agreements and obtained an aggregate $620,000 secured debt financing that matures in August 2026. These loans are secured by one MOB (two buildings). The property encumbered by these mortgages is owned by a joint venture in which we own a 55% equity interest.
Schedule of required principal payments on outstanding debt | Required principal payments on our outstanding debt as of December 31, 2018, are as follows:
Year |  | Principal Payment |  |
2019 |  | $ | 446,140 |  |
2020 |  | 553,785 |  |
2021 |  | 304,083 |  |
2022 |  | 378,357 |  |
2023 |  | 16,657 |  |
Thereafter |  | 1,984,558 |  | (1)
|  | $ | 3,683,580 |  |
(1) The carrying value of our total debt outstanding as of December 31, 2018, including unamortized debt issuance costs, premiums and discounts was $3,648,417.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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